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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties [1] $ 5,698,259 $ 5,655,759
Less: accumulated depreciation, depletion, amortization and impairment (1,539,515) (1,428,427)
Proved oil and gas properties, net 4,158,744 4,227,332
Unproved oil and gas properties 628,768 628,642
Other property and equipment 477,343 443,265
Less: accumulated depreciation (87,686) (80,997)
Other property and equipment, net 389,657 362,268
Total property, plant and equipment, net 5,177,169 5,218,242
Asset retirement costs $ 31,100 $ 30,700
[1] Included in the Company’s proved oil and gas properties are estimates of future asset retirement costs of $31.1 million and $30.7 million at March 31, 2016 and December 31, 2015, respectively.