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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Oil and natural gas properties    
Proved $ 1,145,667 $ 1,056,806
Unproved 87,268 100,884
Total oil and natural gas properties 1,232,935 1,157,690
Less: accumulated depreciation, depletion and impairment (515,822) (460,431)
Net oil and natural gas properties capitalized costs 717,113 697,259
Property, plant and equipment, gross 234,836 241,867
Less accumulated depreciation and amortization (20,933) (15,886)
Other property, plant and equipment, net 213,903 225,981
Total property, plant and equipment, net 931,016 923,240
Land    
Oil and natural gas properties    
Property, plant and equipment, gross 4,500 4,500
Electrical infrastructure    
Oil and natural gas properties    
Property, plant and equipment, gross 131,010 131,010
Other non-oil and natural gas equipment    
Oil and natural gas properties    
Property, plant and equipment, gross 19,778 26,809
Buildings and structures    
Oil and natural gas properties    
Property, plant and equipment, gross $ 79,548 $ 79,548