Quarterly report pursuant to Section 13 or 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
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Oil and natural gas properties $ 8,146,321 $ 6,071,920
Office furniture and fixtures 24,649 21,204
Building 45,204 42,530
Land 5,254 5,252
Total property and equipment 8,221,428 6,140,906
Accumulated depletion, depreciation, amortization and impairment (3,855,629) (3,789,780)
Property and equipment, net $ 4,365,799 $ 2,351,126