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, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Oil and natural gas properties $ 9,470,697 $ 9,169,156
Office furniture and fixtures 40,236 37,369
Building 44,592 44,565
Land 4,820 4,820
Total property and equipment 9,560,345 9,255,910
Accumulated depletion, depreciation, amortization and impairment (4,264,647) (4,153,733)
Property and equipment, net $ 5,295,698 $ 5,102,177