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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties [1] $ 5,774,121 $ 5,655,759
Less: accumulated depreciation, depletion, amortization and impairment (1,657,641) (1,428,427)
Proved oil and gas properties, net 4,116,480 4,227,332
Unproved oil and gas properties 628,527 628,642
Other property and equipment 536,462 443,265
Less: accumulated depreciation (94,735) (80,997)
Other property and equipment, net 441,727 362,268
Total property, plant and equipment, net 5,186,734 5,218,242
Asset retirement costs $ 31,300 $ 30,700
[1] Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $31.3 million and $30.7 million at June 30, 2016 and December 31, 2015, respectively.