| **Business and Summary of Significant Accounting Principles**                       | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 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| **Organization, Consolidation and Presentation of Financial Statements [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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| Business and Summary of Significant Accounting Principles                           | Business and Summary of Significant Accounting PrinciplesIn the following discussion, GCI and its direct and indirect subsidiaries are referred to as “we,” “us” and “our.”(a)BusinessGCI, an Alaska corporation, was incorporated in 1979. We provide a full range of wireless, data, video, voice, and managed services to residential customers, businesses, governmental entities, and educational and medical institutions primarily in Alaska.(b)Basis of Presentation and Principles of ConsolidationOur consolidated financial statements include the consolidated accounts of GCI and its wholly owned subsidiaries, The Alaska Wireless Network, LLC ("AWN") of which we owned a two-third interest through February 2, 2015 when we purchased the remaining one-third interest, and four variable interest entities (“VIEs”) for which we are the primary beneficiary after providing certain loans and guarantees.  These VIEs are Terra GCI Investment Fund, LLC (“TIF”), Terra GCI 2 Investment Fund, LLC (“TIF 2”), Terra GCI 2-USB Investment Fund, LLC (“TIF 2-USB”) and Terra GCI 3 Investment Fund, LLC (“TIF 3”).  We also include in our consolidated financial statements non-controlling interests in consolidated subsidiaries for which our ownership is less than 100 percent.  All significant intercompany transactions between non-regulated affiliates of our company are eliminated.  Intercompany transactions generated between regulated and non-regulated affiliates of our company are not eliminated in consolidation.(c)Non-controlling InterestsNon-controlling interests represent the equity ownership interests in consolidated subsidiaries not owned by us.  Non-controlling interests are adjusted for contributions, distributions, and income and loss attributable to the non-controlling interest partners of the consolidated entities.  Income and loss is allocated to the non-controlling interests based on the respective governing documents.(d)AcquisitionOn February 2, 2015, we purchased Alaska Communications Systems Group, Inc.'s (“ACS”) interest in AWN ("AWN NCI Acquisition") and substantially all the assets of ACS and its affiliates related to ACS’s wireless operations (“Acquired ACS Assets”) (collectively the "Wireless Acquisition"). Under the terms of the agreement, we paid ACS $293.2 million, excluding working capital adjustments and agreed to terminate certain agreements related to the use of ACS network assets that were included as part of the original transaction that closed in July 2013. The Acquired ACS Assets include substantially all of ACS’s wireless subscriber assets, including subscriber contracts, and certain of ACS’s CDMA network assets, including fiber strands and associated cell site electronics and microwave facilities and associated electronics. We assumed from ACS post-closing liabilities of ACS and its affiliates under contracts assumed by us and liabilities with respect to the ownership by ACS of its equity interest in AWN to the extent accruing and related to the period after closing. All other liabilities were retained by ACS and its affiliates.We have accounted for the AWN NCI Acquisition as the acquisition of a non-controlling interest in accordance with Accounting Standards Codification ("ASC") 810, Consolidation, and the Acquired ACS Assets as the acquisition of assets that do not constitute a business in accordance with ASC 805-50, Business Combinations - Related Issues. Total consideration transferred to ACS in the transaction consisted of the cash payment, settlement of working capital, and the fair market value of certain rights to receive future capacity terminated as part of the Wireless Acquisition agreement. The future capacity receivable assets transferred as consideration were adjusted to fair value as of the acquisition date resulting in a gain of $1.2 million recorded in Other Income (Expense) in our Consolidated Statements of Operations for the nine months ended September 30, 2015. We allocated the total consideration transferred to ACS between the AWN NCI Acquisition and the Acquired ACS Assets based on the relative fair values of the assets and non-controlling interest received.The following table summarizes the allocation of total consideration transferred to ACS between the AWN NCI Acquisition and the Acquired ACS Assets excluding working capital adjustments (amounts in thousands):Total consideration transfered to ACS $304,838   Allocation of consideration between wireless assets and non-controlling interest acquired:  AWN non-controlling interest $303,831Property and equipment 746Other intangible assets 261Total consideration  $304,838We have accounted for the AWN NCI Acquisition as an equity transaction, with the carrying amount of the non-controlling interest adjusted to reflect the change in ownership of AWN. The difference between the fair value of consideration paid and the total of the additional deferred taxes incurred as a result of the transaction and the carrying amount of the non-controlling interest has been recognized as additional paid-in capital in our Consolidated Statement of Stockholders' Equity. The impact of the AWN NCI Acquisition is summarized in the following table (amounts in thousands):Reduction of non-controlling interest $268,364Increase in deferred tax assets 24,028Additional paid-in capital 11,439Fair value of consideration paid for acquisition of equity interest $303,831Pursuant to the accounting guidance in ASC 805-50, we determined that the Acquired ACS Assets did not meet the criteria necessary to constitute a business combination and was therefore accounted for as an asset purchase. We recognized the assets acquired in our Consolidated Balance Sheets at their allocated cost on the day of acquisition.In conjunction with the Wireless Acquisition, we amended certain agreements related to the right to use ACS network assets. We adjusted the related right to use asset to fair value as of the acquisition date resulting in a loss of $3.8 million recorded in Other Income (Expense) in our Consolidated Statements of Operations for the nine months ended September 30, 2015.Other AcquisitionsDuring the year ended December 31, 2015, we completed three business acquisitions for total cash consideration of $12.7 million, net of cash received. We accounted for the transactions using the acquisition method of accounting under ASC 805, Business Combinations. Accordingly, the assets received, liabilities assumed and any non-controlling interests were recorded at their estimated fair value as of the acquisition date. We determined the estimated fair values using a combination of the discounted cash flows method and estimates made by management. (e)Recently Issued Accounting PronouncementsIn May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers.  This new standard provides guidance for the recognition, measurement and disclosure of revenue resulting from contracts with customers and will supersede virtually all of the current revenue recognition guidance under GAAP.  In August 2015, the FASB issued ASU 2015-14, which deferred the effective date to fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. In March 2016, the FASB issued ASU 2016-08, which amended the guidance in the new standard in order to clarify the principal versus agent assessment and is intended to make the guidance more operable and lead to more consistent application. In April 2016, the FASB issued ASU 2016-10, which clarifies the identification of performance obligations and the licensing implementation guidance in ASU 2014-09. In May 2016, the FASB issued ASU 2016-11, which rescinds SEC paragraphs pursuant to SEC staff announcements regarding ASU 2014-09. These rescissions include changes to topics pertaining to accounting for shipping and handling fees and costs and accounting for consideration given by a vendor to a customer. In May 2016, the FASB issued ASU 2016-12, which provides clarifying guidance in certain narrow areas and adds some practical expedients to ASU 2014-09. The standard permits the use of either the retrospective or cumulative effect transition method. Early adoption is permitted for annual periods beginning after December 15, 2016, however, we do not plan to early adopt this standard.  We are currently evaluating the impact of the provisions of this new standard and we expect to have our assessment of the impact on our financial position and results of operations to be completed by December 31, 2016.In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. The update addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017. Early adoption is permitted only for certain portions of the ASU related to financial liabilities. We are currently evaluating the impact of the provisions of this new standard on our financial position and results of operations.In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The new standard establishes a right-of-use ("ROU") model that requires a lessee to record a ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. Lease accounting by the lessor remains largely unchanged by the new standard. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and is required to be adopted using the modified retrospective approach. We are currently evaluating the impact of the provisions of this new standard on our financial position and results of operations, but we expect that adoption will have a material impact on our long-term assets and liabilities.In March 2016, the FASB issued ASU No. 2016-07, Simplifying the Transition to the Equity Method of Accounting. The update eliminates the requirement to apply the equity method of accounting retrospectively when a reporting entity obtains significant influence over a previously held investment. Instead, the equity method of accounting should be applied prospectively from the date significant influence is obtained and investors should add the cost of acquiring the additional interest to the current basis of their previously held interest. For available-for-sale securities that become eligible for the equity method of accounting, any unrealized gain or loss recorded within accumulated other comprehensive income should be recognized in earnings at the date the investment initially qualifies for the use of the equity method. ASU 2016-07 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early adoption is permitted and should be applied prospectively. The adoption of this guidance is not expected to have a material effect on our financial position or results of operations.In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, which amends ASC 718, Compensation - Stock Compensation. The update includes provisions intended to simplify various aspects related to how share-based payments are accounted for and presented in the financial statements. ASU 2016-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016. Early adoption is permitted with any adjustments reflected as of the beginning of the fiscal year of adoption. We are currently evaluating the impact of the provisions of this new standard on our financial position and results of operations.In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The update introduces a new forward-looking approach, based on expected losses, to estimate credit losses on certain types of financial instruments, including trade receivables. The estimate of expected credit losses will require entities to incorporate consideration of historical information, current information and reasonable and supportable forecasts. This ASU also expands the disclosure requirements to enable users of financial statements to understand the entity’s assumptions, models and methods for estimating expected credit losses. ASU 2016-13 is effective for annual and interim reporting periods beginning after December 15, 2019, and is required to be adopted using the modified retrospective approach. Early adoption is permitted for annual and interim reporting periods beginning after December 15, 2018. We are currently evaluating the impact of the provisions of this new standard on our financial position and results of operations.In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. This update addresses eight specific cash flow issues with the objective of reducing diversity in practice. The issues identified within the ASU include: debt prepayments or extinguishment costs; contingent consideration made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identified cash flows and application of the predominance principle.  ASU 2016-15 is effective for annual and interim reporting periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted for annual and interim reporting periods. The adoption of this guidance is not expected to have a material effect on our statement of cash flows.(f)Recently Adopted Accounting PronouncementsIn April 2015, the FASB issued ASU No. 2015-03, Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 requires an entity to present debt issuance costs related to a recognized debt liability in the balance sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update. In August 2015, the FASB issued ASU No. 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements which clarifies that the guidance in ASU 2015-03 does not apply to line-of-credit arrangements.  According to ASU 2015-15, line-of-credit arrangements will continue to defer and present debt issuance costs as an asset and subsequently amortize the deferred debt issue costs ratably over the term of the arrangement. We adopted ASU 2015-03 retrospectively as of January 1, 2016, and have reclassified $15.4 million of the December 31, 2015, Deferred Loan and Senior Note Costs, Net of Amortization balance included in Total Other Assets to Long-Term Debt, Net included in Total Liabilities.In April 2015, the FASB issued ASU 2015-05, Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. The ASU provides guidance in evaluating whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the software license element of the arrangement should be accounted for as an acquisition of a software license. If the arrangement does not contain a software license, it should be accounted for as a service contract. We adopted ASU 2015-05 prospectively as of January 1, 2016. The adoption of this standard did not have a significant effect on our financial position or results of operations.In June 2015, the FASB issued ASU No. 2015-10, Technical Corrections and Updates. The amendments in this update cover a wide range of topics in the codification and are generally categorized as follows: Amendments Related to Differences between Original Guidance and the Codification; Guidance Clarification and Reference Corrections; Simplification; and, Minor Improvements. We adopted ASU 2015-10 as of January 1, 2016. The adoption of this standard did not have a significant effect on our financial position or results of operations.In July 2015, the FASB issued ASU 2015-11, Simplifying the Measurement of Inventory. Under ASU 2015-11, inventory will be measured at the “lower of cost and net realizable value” and options that currently exist for “market value” will be eliminated. The ASU defines net realizable value as the “estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation.” No other changes were made to the current guidance on inventory measurement. We adopted ASU 2015-11 prospectively as of April 1, 2016. The adoption of this standard did not have a significant effect on our financial position or results of operations.In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments. The update requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined, including the cumulative effect of the change in provisional amount as if the accounting had been completed at the acquisition date. The adjustments related to previous reporting periods since the acquisition date must be disclosed by income statement line item either on the face of the income statement or in the notes. We adopted ASU 2015-16 as of January 1, 2016. The adoption of this standard did not have a significant effect on our financial position or results of operations.(g)Regulatory AccountingWe account for the regulated operations of our incumbent local exchange carriers in accordance with the accounting principles for regulated enterprises.  This accounting recognizes the economic effects of rate regulation by recording cost and a return on investment as such amounts are recovered through rates authorized by regulatory authorities.  Accordingly, plant and equipment is depreciated over lives approved by regulators and certain costs and obligations are deferred based upon approvals received from regulators to permit recovery of such amounts in future years.  Our cost studies and depreciation rates for our regulated operations are subject to periodic audits that could result in a change to recorded revenues.(h)Earnings (Loss) per Common ShareWe compute net income (loss) attributable to GCI per share of Class A and Class B common stock using the “two class” method.  Therefore, basic net income (loss) per share is computed by dividing net income (loss) applicable to common stockholders by the weighted average number of common shares outstanding during the period.  Diluted net income (loss) per share is computed by dividing net income (loss) by the weighted average number of common and dilutive common equivalent shares outstanding during the period. The computation of the dilutive net income (loss) per share of Class A common stock assumes the conversion of Class B common stock to Class A common stock, while the dilutive net income (loss) per share of Class B common stock does not assume the conversion of those shares. The computation of the dilutive net income (loss) per share of Class A common stock also assumes the conversion of our derivative financial instrument that may be settled in cash or shares (as described in Note 5 of this Form 10-Q), shares associated with unexercised stock options and deferred compensation that may be settled in cash or shares if the effect of conversion is dilutive. Additionally, in applying the “two-class” method, undistributed earnings are allocated to both common shares and participating securities. Our restricted stock grants are entitled to dividends and meet the criteria of a participating security.We allocate undistributed earnings in periods of net income based on the contractual participation rights of Class A common shares, Class B common shares, and participating securities as if the earnings for the period had been distributed. We do not allocate undistributed earnings to participating securities in periods in which we have a net loss. In accordance with our Articles of Incorporation, if and when dividends are declared on our common stock in accordance with Alaska corporate law, equivalent dividends shall be paid with respect to the shares of Class A and Class B common stock, including participating securities. Both classes of common stock have identical dividend rights and would therefore share equally in our net assets in the event of liquidation. As such, we have allocated undistributed earnings on a proportionate basis. (i)Common StockWe have a common stock buyback program to repurchase GCI's Class A and Class B common stock. The cost of the repurchased common stock reduces Retained Earnings in our Consolidated Balance Sheets and is treated as constructively retired when purchased.(j)Accounts Receivable and Allowance for Doubtful ReceivablesTrade accounts receivable are recorded at the invoiced amount and do not bear interest. The allowance for doubtful receivables is our best estimate of the amount of probable credit losses in our existing accounts receivable. We base our estimates on the aging of our accounts receivable balances, financial health of specific customers, regional economic data, changes in our collections process, regulatory requirements and our customers’ compliance with Universal Service Administrative Company rules. We review our allowance for doubtful receivables methodology at least annually.Depending upon the type of account receivable, our allowance is calculated using a pooled basis for all accounts greater than 120 days past due, a pooled basis using a percentage of related accounts, or a specific identification method.  When a specific identification method is used, potentially uncollectible accounts due to bankruptcy or other issues are reviewed individually for collectability.  Account balances are charged off against the allowance when we believe it is probable the receivable will not be recovered. We do not have any off-balance-sheet credit exposure related to our customers.Wireless Equipment Installment Plan ("EIP") ReceivablesWe offer new and existing wireless customers the option to participate in Upgrade Now, a program that provides eligible customers with the ability to purchase certain wireless devices in installments over a period of up to 24 months. Participating customers have the right to trade-in the original equipment for a new device after making the equivalent of 12 monthly installment payments, provided their handset is in good working condition.  Upon upgrade, the outstanding balance of the EIP is exchanged for the used handset.At the time of sale, we impute interest on the receivables associated with Upgrade Now. We record the imputed interest as a reduction to the related accounts receivable. Interest income, which is included in Other Income and (Expense) in our Consolidated Statements of Operations, is recognized over the financed installment term.We assess the collectability of our EIP receivables based upon a variety of factors, including payment trends and other qualitative factors. The credit profiles of our customers with an Upgrade Now plan are similar to those of our customers with a traditional subsidized plan. Customers with a credit profile which carries a higher risk are required to make a down payment for equipment financed through Upgrade Now.(k)Derivative Financial InstrumentWe account for our derivative instrument in accordance with ASC 815-10, Derivatives and Hedging. ASC 815-10 establishes accounting and reporting standards requiring that derivative instruments, including derivative instruments embedded in other contracts, be recorded on the balance sheet as either an asset or liability measured at its fair value. ASC 815-10 also requires that changes in the fair value of derivative instruments be recognized currently in results of operations unless specific hedge accounting criteria are met. We have not entered into any hedging activities to date. We recognize all derivative instruments as either assets or liabilities in our Consolidated Balance Sheets at their respective fair values. Our stock appreciation rights derivative instrument ("SAR") (as described in Note 5 of this Form 10-Q) is recorded as a liability at fair value and is included within Other Liabilities in our Consolidated Balance Sheets. The SAR is revalued at each reporting date, with changes in the fair value of the instrument included in our Consolidated Statements of Operations as Derivative Instrument Unrealized Income (Loss) with Related Party.(l)GuaranteesWe offer a device trade-in program, "Upgrade Now", which provides eligible customers a specified-price trade-in right to upgrade their device. Participating customers must have purchased a financed device using an equipment installment plan from us and have a qualifying monthly wireless service plan. Upon qualifying for an Upgrade Now device trade-in, the customer's remaining EIP balance is settled provided they trade in their eligible used device in good working condition and purchase a new device from us on a new EIP.For customers who enroll in Upgrade Now, we defer the portion of equipment sales revenue which represents the estimated value of the trade-in right guarantee. The estimated value of the guarantees are based on various economic and customer behavioral assumptions, including the customer's estimated remaining EIP balance at trade-in, the expected fair value of the used handset at trade-in and the probability and timing of a trade-in.We assess facts and circumstances at each reporting date to determine if we need to adjust the guarantee liability. The recognition of subsequent adjustments to the guarantee liability as a result of these assessments are recorded as adjustments to revenue. When customers upgrade their devices, the difference between the trade-in credit to the customer and the fair value of the returned devices is recorded against the guarantee liabilities. (m)Revenue RecognitionAs an Eligible Telecommunications Carrier ("ETC"), we receive support from the Universal Service Fund ("USF") to support the provision of wireline local access and wireless service in high cost areas. On August 31, 2016, the Federal Communications Commission ("FCC") published a Report and Order to reform the methodology for distributing USF high cost support for both wireline and wireless voice and broadband service (“Alaska High Cost Order”).  The Alaska High Cost Order was a significant program change that required a reassessment of our high cost support revenue recognition.Remote High Cost SupportPrior to the Alaska High Cost Order, we accrued estimated program revenue based on current line counts and the frozen per-line rates, reduced as needed by our estimate of the impact of the Statewide Support Cap. Additionally, we also considered our assessment of the impact of current FCC regulations and of the potential outcome of FCC proceedings. As of January 1, 2017, Remote high cost support payments to Alaska High Cost participants will be frozen on a per-company basis at adjusted December 2014 levels for a ten-year term in exchange for meeting individualized performance obligations to offer voice and broadband services meeting the service obligations at specified minimum speeds by five-year and ten-year service milestones to a specified number of locations.  Remote high cost support is no longer dependent upon line counts and line count filings are no longer required.As a result of the Alaska High Cost Order, we apply the proportional performance revenue recognition method to account for the transition from accruals based on line counts to a fixed payment stream while our level of service provided and associated costs remain constant.  Included in the calculation are the scheduled Remote high cost support payments from September 2016 through January 2027 net of our Remote accounts receivable balance at August 31, 2016.  In 2022, the FCC may redistribute support in areas with duplicative LTE service.  We will account for any changes made by the FCC to redistribute support prospectively. Urban High Cost SupportPrior to the Alaska High Cost Order, Urban high cost support payments were frozen and had phased down to 60% of the monthly average of the 2011 annual support.  The Alaska High Cost Order mandates that as of January 1, 2017, Urban high cost support for 2017 and 2018 will be two-thirds and one-third of the December 2014 level of support received, respectively. We apply the proportional performance revenue recognition method to account for the impact of the declining payments while our level of service provided and associated costs remain constant. Included in the calculation are the scheduled Urban high cost support payments from September 2016 through January  2018 net of our Urban accounts receivable balance at August 31, 2016. An equal amount of this result is recognized as Urban support revenue each period.For both Remote and Urban high cost support revenue, our ability to collect our accrued USF support is contingent upon continuation of the USF program and upon our eligibility to participate in that program, which are subject to change by future regulatory, legislative or judicial actions. We adjust revenue and the account receivable in the period the FCC makes a program change or we assess the likelihood that such a change has increased or decreased revenue. We do not recognize revenue related to a particular service area until our ETC status has been approved by the RCA.We recorded high cost support revenue under the Universal Service Fund (“USF”) program of $15.9 million and $16.5 million for the three months ended September 30, 2016 and 2015, respectively, and $48.4 million and $50.6 million for the nine months ended September 30, 2016 and 2015, respectively.  At September 30, 2016, we have $44.7 million in high cost support accounts receivable.(n)Use of EstimatesThe preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period.  Significant items subject to estimates and assumptions include the allowance for doubtful receivables, unbilled revenues, accrual of the USF high cost program support, share-based compensation, inventory at lower of cost and net realizable value, reserve for future customer credits, liability for incurred but not reported medical insurance claims, valuation allowances for deferred income tax assets, depreciable and amortizable lives of assets, the carrying value of long-lived assets including goodwill, cable certificates, wireless licenses,and broadcast licenses, the fair value of equity method investments evaluated for impairment, our effective tax rate, imputed interest rate, purchase price allocations, deferred lease expense, asset retirement obligations, the accrual of cost of goods sold (exclusive of depreciation and amortization expense), depreciation, the derivative stock appreciation rights liability, guarantees, and the accrual of contingencies and litigation.  Actual results could differ from those estimates.(o)Classification of Taxes Collected from CustomersWe report sales, use, excise, and value added taxes assessed by a governmental authority that is directly imposed on a revenue-producing transaction between us and a customer on a net basis in our Consolidated Statements of Operations.  The following are certain surcharges reported on a gross basis in our Consolidated Statements of Operations (amounts in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2016 2015 2016 2015Surcharges reported gross$951 1,426 2,973 3,960(p)ReclassificationsReclassifications have been made to the 2015 financial statements to make them comparable with classifications used in the current year. |

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| - Definition
The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows.  Describes procedure if disclosures are provided in more than one note to the financial statements.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6003-108592
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