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Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Oil and natural gas properties, using full cost method of accounting
Proved	$ 1,463,950	$ 1,484,359
Unproved	17,964	24,603
Total oil and natural gas properties	1,481,914	1,508,962
Less: accumulated depreciation, depletion and impairment	(1,375,692)	(1,129,622)
Net oil and natural gas properties capitalized costs	106,222	379,340
Property, Plant and Equipment, Net
Financing Leases	1,051	2,109
Total	128,236	222,804
Less accumulated depreciation and amortization	(25,118)	(34,201)
Other property, plant and equipment, net	103,118	188,603
Total property, plant and equipment, net	209,340	567,943
Land
Property, Plant and Equipment, Net
Property, plant and equipment, gross	200	4,400
Electrical infrastructure
Property, Plant and Equipment, Net
Property, plant and equipment, gross	121,819	126,482
Non-oil and natural gas equipment
Property, Plant and Equipment, Net
Property, plant and equipment, gross	1,563	12,665
Buildings and structures
Property, Plant and Equipment, Net
Property, plant and equipment, gross	$ 3,603	$ 77,148

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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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