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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Oil and natural gas properties |  |
Proved | $ 1,442,972 | $ 1,463,950
Unproved | 12,905 | 17,964
Total oil and natural gas properties | 1,455,877 | 1,481,914
Less: accumulated depreciation, depletion and impairment | (1,371,123) | (1,375,692)
Net oil and natural gas properties | 84,754 | 106,222
Property, Plant and Equipment, net |  |
Financing leases | 1,128 | 1,051
Total | 128,352 | 128,236
Less: accumulated depreciation and amortization | (29,401) | (25,118)
Other property, plant and equipment, net | 98,951 | 103,118
Total property, plant and equipment, net | 183,705 | 209,340
Land |  |
Property, Plant and Equipment, net |  |
Property, plant and equipment, gross | 200 | 200
Electrical infrastructure |  |
Property, Plant and Equipment, net |  |
Property, plant and equipment, gross | 121,819 | 121,819
Other non-oil and natural gas equipment |  |
Property, Plant and Equipment, net |  |
Property, plant and equipment, gross | 1,602 | 1,563
Buildings and structures |  |
Property, Plant and Equipment, net |  |
Property, plant and equipment, gross | $ 3,603 | $ 3,603

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- Definition Amount of accumulated depreciation, depletion, amortization and valuation allowance relating to oil and gas producing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61901-109447 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=123726172&loc=d3e511914-122862 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123377692&loc=d3e61901-109447 + Details
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