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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 6,671,833 $ 6,476,833
Less: accumulated depreciation, depletion, amortization and impairment (2,130,330) (1,886,732)
Proved oil and gas properties, net 4,541,503 4,590,101
Unproved oil and gas properties 816,242 819,735
Other property and equipment 695,592 618,790
Less: accumulated depreciation (122,323) (109,059)
Other property and equipment, net 573,269 509,731
Total property, plant and equipment, net $ 5,931,014 $ 5,919,567