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Income Taxes - Income Tax Expense (Benefit) Attributable to Income Before Income Taxes (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
U.S. federal, Current |  |  |  |  |  |  |  |  |  |  |
U.S. state and local, Current |  |  |  |  |  |  |  |  | 1 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (143)us-gaap_CurrentStateAndLocalTaxExpenseBenefit | (1,778)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total, Current | (4)us-gaap_CurrentIncomeTaxExpenseBenefit |  | (1)us-gaap_CurrentIncomeTaxExpenseBenefit | 6 us-gaap_CurrentIncomeTaxExpenseBenefit | (143)us-gaap_CurrentIncomeTaxExpenseBenefit |  | (25)us-gaap_CurrentIncomeTaxExpenseBenefit | 25 us-gaap_CurrentIncomeTaxExpenseBenefit | 1 us-gaap_CurrentIncomeTaxExpenseBenefit | (143)us-gaap_CurrentIncomeTaxExpenseBenefit | (1,778)us-gaap_CurrentIncomeTaxExpenseBenefit
U.S. federal, Deferred |  |  |  |  |  |  |  |  | 361,152 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 58,527 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 11,873 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
U.S. state and local, Deferred |  |  |  |  |  |  |  |  | 35,350 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | (24,527)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1,959 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total, Deferred | 166,052 us-gaap_DeferredIncomeTaxExpenseBenefit | 93,522 us-gaap_DeferredIncomeTaxExpenseBenefit | 117,977 us-gaap_DeferredIncomeTaxExpenseBenefit | 18,951 us-gaap_DeferredIncomeTaxExpenseBenefit | (28,180)us-gaap_DeferredIncomeTaxExpenseBenefit | 11,866 us-gaap_DeferredIncomeTaxExpenseBenefit | 97,519 us-gaap_DeferredIncomeTaxExpenseBenefit | (47,205)us-gaap_DeferredIncomeTaxExpenseBenefit | 396,502 us-gaap_DeferredIncomeTaxExpenseBenefit | 34,000 us-gaap_DeferredIncomeTaxExpenseBenefit | 13,832 us-gaap_DeferredIncomeTaxExpenseBenefit
U.S. federal, Total |  |  |  |  |  |  |  |  | 361,152 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 58,527 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations | 11,873 us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
U.S. state and local, Total |  |  |  |  |  |  |  |  | 35,351 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | (24,670)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations | 181 us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Total income tax expense | $ 166,048 us-gaap_IncomeTaxExpenseBenefit | $ 93,522 us-gaap_IncomeTaxExpenseBenefit | $ 117,976 us-gaap_IncomeTaxExpenseBenefit | $ 18,957 us-gaap_IncomeTaxExpenseBenefit | $ (28,323)us-gaap_IncomeTaxExpenseBenefit | $ 11,866 us-gaap_IncomeTaxExpenseBenefit | $ 97,494 us-gaap_IncomeTaxExpenseBenefit | $ (47,180)us-gaap_IncomeTaxExpenseBenefit | $ 396,503 us-gaap_IncomeTaxExpenseBenefit | $ 33,857 us-gaap_IncomeTaxExpenseBenefit | $ 12,054 us-gaap_IncomeTaxExpenseBenefit

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