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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |
General and administrative expense | $ (97,786) | $ (85,633) | $ (67,996)
Loss before income taxes | (228,435) | (659,599) | (187,273)
Income tax benefit (expense) | 328,828 | 242,475 | 73,382
NET INCOME (LOSS) | 100,393 | (417,124) | (113,891)
Amount Reclassified from Accumulated Other Comprehensive Income |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |
Loss before income taxes | 2,733 | (111) | 0
Income tax benefit (expense) | (1,010) | 41 | 0
NET INCOME (LOSS) | 1,723 | (70) | 0
Amortization of prior service cost | Amount Reclassified from Accumulated Other Comprehensive Income |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |
General and administrative expense | $ 2,733 | $ (111) | $ 0

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- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1377-109256 + Details
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