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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Oil and natural gas properties
Proved	$ 1,206,363	$ 1,056,806
Unproved	68,737	100,884
Total oil and natural gas properties	1,275,100	1,157,690
Less: accumulated depreciation, depletion and impairment	(546,769)	(460,431)
Net oil and natural gas properties capitalized costs	728,331	697,259
Property, Plant and Equipment, Net
Property, plant and equipment, gross	234,729	241,867
Less accumulated depreciation and amortization	(23,531)	(15,886)
Other property, plant and equipment, net	211,198	225,981
Total property, plant and equipment, net	939,529	923,240
Land
Property, Plant and Equipment, Net
Property, plant and equipment, gross	4,500	4,500
Electrical infrastructure
Property, Plant and Equipment, Net
Property, plant and equipment, gross	131,010	131,010
Other non-oil and natural gas equipment
Property, Plant and Equipment, Net
Property, plant and equipment, gross	19,671	26,809
Buildings and structures
Property, Plant and Equipment, Net
Property, plant and equipment, gross	$ 79,548	$ 79,548

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The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs.

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Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table.

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