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Supplemental Information on Oil and Natural Gas Producing Activities - Results of Operations from Oil and Natural Gas Producing Activities (Unaudited) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Extractive Industries [Abstract] |  |  |
Revenues | $ 707,434 | $ 1,420,879 | $ 1,820,278
Expenses |  |  |
Production costs | 324,141 | 377,819 | 548,719
Depreciation and depletion | 319,913 | 434,295 | 567,732
Accretion of asset retirement obligations | 4,477 | 9,092 | 36,777
Impairment | 4,473,787 | 164,779 | 0
Total expenses | 5,122,318 | 985,985 | 1,153,228
(Loss) income before income taxes | (4,414,884) | 434,894 | 667,050
Income tax expense (benefit) | 126 | (2,852) | (7,471)
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs) | $ (4,415,010) | $ 437,746 | $ 674,521

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- Definition Revenue from the sale of oil and gas during the period. + References Reference 1: 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=51678428&loc=d3e62246-109447 Reference 2: 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=26872669&loc=d3e20235-122688 Reference 3: 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=51678428&loc=d3e62136-109447 + Details
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- Definition Accretion expense of asset retirement obligations related to oil and gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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