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Income Taxes - Income Tax (Benefit) Expense Attributable to Income Before Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
U.S. federal, Current |  |  |  |  |  |  |  |  | $ 0 |  |
U.S. state and local, Current |  |  |  |  |  |  |  |  | 29 | $ 1 | $ (143)
Total, Current | $ 29 |  |  |  | $ (4) |  | $ (1) | $ 6 | 29 | 1 | (143)
U.S. federal, Deferred |  |  |  |  |  |  |  |  | (328,257) | 361,152 | 58,527
U.S. state and local, Deferred |  |  |  |  |  |  |  |  | (10,449) | 35,350 | (24,527)
Total, Deferred | (164,316) | $ (134,781) | $ (61,975) | $ 22,366 | 166,052 | $ 93,522 | 117,977 | 18,951 | (338,706) | 396,502 | 34,000
U.S. federal, Total |  |  |  |  |  |  |  |  | (328,257) | 361,152 | 58,527
U.S. state and local, Total |  |  |  |  |  |  |  |  | (10,420) | 35,351 | (24,670)
Total income tax expense | $ (164,287) | $ (134,781) | $ (61,975) | $ 22,366 | $ 166,048 | $ 93,522 | $ 117,976 | $ 18,957 | $ (338,677) | $ 396,503 | $ 33,857

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