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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |
Natural gas revenues | $ 1,022,590 | $ 1,025,044 | $ 1,590,625
Crude oil and condensate revenues | 151,106 | 248,211 | 313,889
General and administrative | 87,242 | 69,444 | 82,590
Income (loss) before income taxes | (659,599) | (187,273) | 32,401
Income tax benefit | 242,475 | 73,382 | 72,067
NET INCOME (LOSS) | (417,124) | (113,891) | 104,468
Amount Reclassified from Accumulated Other Comprehensive Income |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |
Income (loss) before income taxes | (111) | 0 | (144,177)
Income tax benefit | 41 | 0 | 57,467
NET INCOME (LOSS) | (70) | 0 | (86,710)
Net gains (losses) on cash flow hedges | Amount Reclassified from Accumulated Other Comprehensive Income | Commodity contracts |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |
Natural gas revenues | 0 | 0 | (143,577)
Crude oil and condensate revenues | 0 | 0 | (626)
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 | 111 | 0 | 0
Amortization of net (gain) loss | Amount Reclassified from Accumulated Other Comprehensive Income |  |  |
Line items in income statement impacted by reclassifications out of accumulated other comprehensive income |  |  |
General and administrative | $ 0 | $ 0 | $ (26)

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- Definition Revenue from natural gas production during the reporting period. Natural gas consists largely of the hydrocarbon methane, and is found in underground formations either by itself or with crude oil. + 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 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447 + Details
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