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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Income Taxes [Abstract]          
Gross Deferred Income Tax Expense (Benefit) $ 18,900 $ 31,600 $ 35,700 $ 164,000  
Deferred Income Tax Expense (Benefit)     3,804 $ (164,014)  
Deferred income tax assets [Abstract]          
Valuation allowance 161,100   161,100   $ 121,600
Valuation Allowance, Deferred Tax Asset, Change in Amount $ 22,300   $ 39,500    
Income Tax Examination [Line Items]          
Effective Income Tax Rate Reconciliation, Percent, Total (8.80%) 31.10% (4.60%) 36.30%  
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     2015