|**Segments (Tables)**                                                   | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            
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|**Segment Reporting [Abstract]**                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Schedule of Segment Reporting Information, by Segment                   | Summarized financial information for our reportable segments for the three months endedMarch 31, 2015and2014follows (amounts in thousands):Three Months EndedWirelessWirelineTotal Reportable SegmentsMarch 31, 2015Revenues$59,204171,885231,089Adjusted EBITDA$37,38737,91675,303March 31, 2014Revenues$62,517153,766216,283Adjusted EBITDA$38,02236,77574,797                                                                                                                                                                                                          
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|                                                                        | Three Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                        | Wireless                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|March 31, 2015                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Revenues                                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Adjusted EBITDA                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|March 31, 2014                                                          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
|Revenues                                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Adjusted EBITDA                                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Reconciliation of Operating Profit (Loss) from Segments to Consolidated | A reconciliation of reportable segment Adjusted EBITDA to consolidated income (loss) before income taxes follows (amounts in thousands):Three Months Ended March 31,20152014Reportable segment Adjusted EBITDA$75,30374,797Less depreciation and amortizationexpense(45,235)(42,352)Less software impairment charge(26,417)—Less share-based compensationexpense(2,801)(1,778)Less accretion expense(450)(301)Other341(101)Consolidated operating income74130,265Less other expense, net(26,252)(18,308)Consolidated income (loss) beforeincome tax expense$(25,511)11,957
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|                                                                        | Three Months Ended March 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                        | 2015                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Reportable segment Adjusted EBITDA                                      | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
|Less depreciation and amortizationexpense                               | (45,235                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Less software impairment charge                                         | (26,417                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Less share-based compensationexpense                                    | (2,801                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
|Less accretion expense                                                  | (450                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Other                                                                   | 341                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Consolidated operating income                                           | 741                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Less other expense, net                                                 | (26,252                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Consolidated income (loss) beforeincome tax expense                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

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