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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |
U.S. federal, Current |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0
U.S. state and local, Current |  |  |  |  |  |  |  |  | 98 | 29 | 1
Total, Current | $ 98 | $ 0 | $ 0 | $ 0 | $ 29 | $ 0 | $ 0 | $ 0 | 98 | 29 | 1
U.S. federal, Deferred |  |  |  |  |  |  |  |  | (266,105) | (328,257) | 361,152
U.S. state and local, Deferred |  |  |  |  |  |  |  |  | (14,743) | (10,449) | 35,350
Total, Deferred | (95,679) | (13,705) | (129,488) | (41,976) | (164,316) | (134,781) | (61,975) | 22,366 | (280,848) | (338,706) | 396,502
U.S. federal, Total |  |  |  |  |  |  |  |  | (266,105) | (328,257) | 361,152
U.S. state and local, Total |  |  |  |  |  |  |  |  | (14,645) | (10,420) | 35,351
Total income tax (benefit) expense | $ (95,581) | $ (13,705) | $ (129,488) | $ (41,976) | $ (164,287) | $ (134,781) | $ (61,975) | $ 22,366 | $ (280,750) | $ (338,677) | $ 396,503

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- Definition Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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