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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 7,484,783 $ 7,058,782
Less: Accumulated depreciation, depletion, amortization and impairment (2,538,739) (2,395,153)
Proved oil and gas properties, net 4,946,044 4,663,629
Unproved oil and gas properties 1,426,313 780,173
Other property and equipment 963,871 868,746
Less: Accumulated depreciation (149,622) (139,062)
Other property and equipment, net 814,249 729,684
Total property, plant and equipment, net $ 7,186,606 $ 6,173,486