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Chief Executive Officer Retirement (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Related Party Transaction [Line Items] |  |  |
Retirement severance expense | $ 18,578 | $ 0 | $ 0
Employee Severance [Member] | Expected Cash Payment [Member] | Chief Executive Officer [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Retirement severance expense | 11,800 |  |
Employee Severance [Member] | Taxes and Other Expenses [Member] | Chief Executive Officer [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Retirement severance expense | 400 |  |
Nonvested Shares [Member] | Employee Severance [Member] | Accelerated Vesting of Shares [Member] | Chief Executive Officer [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Retirement severance expense | $ 5,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number | 113,900 |  |
Stock Options [Member] | Employee Severance [Member] | Accelerated Vesting of Shares [Member] | Chief Executive Officer [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Retirement severance expense | $ 1,400 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number | 101,640 |  |

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