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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Oil and natural gas properties
Proved	$ 1,103,921	$ 1,056,806
Unproved	91,793	100,884
Total oil and natural gas properties	1,195,714	1,157,690
Less: accumulated depreciation, depletion and impairment	(486,645)	(460,431)
Net oil and natural gas properties capitalized costs	709,069	697,259
Property, plant and equipment, gross	235,074	241,867
Less accumulated depreciation and amortization	(18,209)	(15,886)
Other property, plant and equipment, net	216,865	225,981
Total property, plant and equipment, net	925,934	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	20,016	26,809
Buildings and structures
Oil and natural gas properties
Property, plant and equipment, gross	$ 79,548	$ 79,548

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All property, plant and equipment (including oil and gas properties) held by the entity, net of accumulated depletion, amortization, depreciation and impairment.

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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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