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Properties and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 5,247,016 $ 4,932,512
Unproved oil and gas properties 189,436 190,474
Gathering and pipeline systems 1,569 1,569
Land, building and other equipment 83,293 82,670
Properties and equipment, gross, total 5,521,314 5,207,225
Accumulated depreciation, depletion and amortization (2,295,821) (2,135,021)
Properties and equipment, net $ 3,225,493 $ 3,072,204