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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Income Taxes [Abstract] |  |  |
Gross Deferred Income Tax Expense (Benefit) | $ 13,200 |  |
Deferred Income Tax Expense (Benefit) | 934 | $ (79,237) |
Deferred income tax assets [Abstract] |  |  |
Valuation allowance | 135,800 |  | $ 121,600
Valuation Allowance, Deferred Tax Asset, Change in Amount | $ 14,200 |  |
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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