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Properties and Equipment, Net - Schedule of PPE (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]    
Proved oil and gas properties $ 7,543,345 $ 8,821,146
Unproved oil and gas properties 325,857 390,434
Gathering and pipeline systems 191,848 243,672
Land, building and other equipment 80,397 117,848
Properties and equipment, gross, total 8,141,447 9,573,100
Accumulated depreciation, depletion and amortization (3,378,767) (4,596,221)
Properties and equipment, net $ 4,762,680 $ 4,976,879