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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
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