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Properties and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 5,489,836 $ 4,932,512
Unproved oil and gas properties 199,219 190,474
Gathering and pipeline systems 1,569 1,569
Land, building and other equipment 86,953 82,670
Properties and equipment, gross, total 5,777,577 5,207,225
Accumulated depreciation, depletion and amortization (2,411,340) (2,135,021)
Properties and equipment, net $ 3,366,237 $ 3,072,204