| **Employee Benefit Plans**                            | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
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| **Compensation and Retirement Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Employee Benefit Plans                                | Employee Benefit PlansThe Company maintains a 401(k) retirement plan covering substantially all officers and employees of the Company, which permits participants to defer up to the maximum allowable amount determined by the IRS of their eligible compensation. As part of the Pension Plan termination in 2014, the Company directed the Pension Plan to transfer $7.9 million of the Pension Plan’s surplus assets into a suspense account in the Company’s 401(k) Plan.  The Company has retained the risks and rewards of ownership of these assets; therefore, the assets held in the suspense account are included in the Company’s condensed consolidated financial statements until they are allocated to participants.  At June 30, 2016 and December 31, 2015, the fair values of these assets were recorded in restricted investments on the Company’s condensed consolidated balance sheets and were $5.7 million and $7.1 million, respectively. The Company expenses the fair value of the assets at the time the assets are allocated to participants, which is expected to be up to the next five years.  During the six months ended June 30, 2016 and 2015, the Company recorded an expense of $1.4 million and $0.9 million, respectively, for the fair value of the assets, less expenses, that were allocated to participants during that period.  In addition, any gains and losses on these assets are reflected in the Company’s condensed consolidated financial statements and were less than a $0.1 million gain for both the three and six months ended June 30, 2016 and 2015.  Refer to Note 5, Financial Instruments and Fair Value Measurements. |

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No definition available.
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| - Definition
The entire disclosure for pension and other postretirement benefits.
+ References
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