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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
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
U.S. federal, Current |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
U.S. state and local, Current |  |  |  |  |  |  |  |  | 17 | 98 | 29
Total, Current | $ 17 | $ 0 | $ 0 | $ 0 | $ 98 | $ 0 | $ 0 | $ 0 | 17 | 98 | 29
U.S. federal, Deferred |  |  |  |  |  |  |  |  | (302,507) | (266,105) | (328,257)
U.S. state and local, Deferred |  |  |  |  |  |  |  |  | 51,464 | (14,743) | (10,449)
Total, Deferred | (349,097) | (71,992) | 57,651 | 112,395 | (95,679) | (13,705) | (129,488) | (41,976) | (251,043) | (280,848) | (338,706)
U.S. federal, Total |  |  |  |  |  |  |  |  | (302,507) | (266,105) | (328,257)
U.S. state and local, Total |  |  |  |  |  |  |  |  | 51,481 | (14,645) | (10,420)
Total (benefit) expense for income taxes | $ (349,080) | $ (71,992) | $ 57,651 | $ 112,395 | $ (95,581) | $ (13,705) | $ (129,488) | $ (41,976) | $ (251,026) | $ (280,750) | $ (338,677)

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