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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Oil and natural gas properties    
Proved $ 1,344,552 $ 1,269,091
Unproved 57,363 60,152
Total oil and natural gas properties 1,401,915 1,329,243
Less: accumulated depreciation, depletion and impairment (614,972) (580,132)
Net oil and natural gas properties capitalized costs 786,943 749,111
Property, Plant and Equipment, net    
Property, plant and equipment, gross 227,861 226,182
Less accumulated depreciation and amortization (27,847) (25,344)
Other property, plant and equipment, net 200,014 200,838
Total property, plant and equipment, net 986,957 949,949
Land    
Property, Plant and Equipment, net    
Property, plant and equipment, gross 4,400 4,400
Electrical infrastructure    
Property, Plant and Equipment, net    
Property, plant and equipment, gross 131,176 131,176
Other non-oil and natural gas equipment    
Property, Plant and Equipment, net    
Property, plant and equipment, gross 13,410 13,458
Buildings and structures    
Property, Plant and Equipment, net    
Property, plant and equipment, gross 77,148 77,148
Financing leases    
Property, Plant and Equipment, net    
Property, plant and equipment, gross $ 1,727 $ 0