Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies - Schedule of Oil and Natural Gas Properties and Other, Net at Cost (Details)

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Significant Accounting Policies - Schedule of Oil and Natural Gas Properties and Other, Net at Cost (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment Net [Abstract]    
Oil and natural gas properties and equipment $ 8,169,871 $ 8,102,044
Furniture, fixtures and other 20,228 21,831
Total property and equipment 8,190,099 8,123,875
Less accumulated depreciation, depletion and amortization 7,674,678 7,544,859
Oil and natural gas properties and other, net $ 515,421 $ 579,016