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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties [1] $ 6,570,588 $ 6,476,833
Less: accumulated depreciation, depletion, amortization and impairment (2,009,356) (1,886,732)
Proved oil and gas properties, net 4,561,232 4,590,101
Unproved oil and gas properties 819,711 819,735
Other property and equipment 632,318 618,790
Less: accumulated depreciation (116,780) (109,059)
Other property and equipment, net 515,538 509,731
Total property, plant and equipment, net $ 5,896,481 $ 5,919,567
[1] Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $43.0 million and $42.9 million at March 31, 2017 and December 31, 2016, respectively.