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, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Oil and natural gas properties $ 6,071,920 $ 5,424,342
Office furniture and fixtures 21,204 12,589
Building 42,530 16,915
Land 5,252 3,667
Total property and equipment 6,140,906 5,457,513
Accumulated depletion, depreciation, amortization and impairment (3,789,780) (2,829,110)
Property and equipment, net $ 2,351,126 $ 2,628,403