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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |  |  |
Gross Deferred Income Tax Expense (Benefit) | $ 3,600 | $ 53,200 | $ 16,800 | $ 132,500 |
Deferred Income Tax Expense (Benefit) |  |  | 332 | $ (132,462) |
Deferred income tax assets [Abstract] |  |  |  |  |
Valuation allowance | 138,800 |  | 138,800 |  | $ 121,600
Valuation Allowance, Deferred Tax Asset, Change in Amount | $ 3,000 |  | $ 17,200 |  |
Income Tax Examination [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent, Total | (0.30%) | 38.30% | (2.20%) | 37.80% |
Internal Revenue Service (IRS) [Member] | Minimum [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years open for future examination |  |  | 2012 |  |
Internal Revenue Service (IRS) [Member] | Maximum [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Tax years open for future examination |  |  | 2014 |  |

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