Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Schedule of Property and Equipment (Details)

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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Oil and natural gas properties $ 9,169,156 $ 6,071,920
Office furniture and fixtures 37,369 21,204
Building 44,565 42,530
Land 4,820 5,252
Total property and equipment 9,255,910 6,140,906
Accumulated depletion, depreciation, amortization and impairment (4,153,733) (3,789,780)
Property and equipment, net $ 5,102,177 $ 2,351,126