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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2021 |  | 2020
Oil and natural gas properties |  |  |
Proved | $ | 1,454,016 |  |  | $ | 1,463,950 |
Unproved | 12,255 |  |  | 17,964 |
Total oil and natural gas properties | 1,466,271 |  |  | 1,481,914 |
Less accumulated depreciation, depletion and impairment | (1,373,217) |  |  | (1,375,692) |
Net oil and natural gas properties capitalized costs | 93,054 |  |  | 106,222 |
Land | 200 |  |  | 200 |
Electrical infrastructure | 121,819 |  |  | 121,819 |
Non-oil and natural gas equipment | 1,575 |  |  | 1,563 |
Buildings and structures | 3,603 |  |  | 3,603 |
Financing Leases | 1,384 |  |  | 1,051 |
Total | 128,581 |  |  | 128,236 |
Less accumulated depreciation and amortization | (30,790) |  |  | (25,118) |
Other property, plant and equipment, net | 97,791 |  |  | 103,118 |
Total property, plant and equipment, net | $ | 190,845 |  |  | $ | 209,340 |
The average rates used for depreciation and depletion of oil and natural gas properties were $0.78 per Boe in 2021, $5.11 per Boe in 2020 and $12.28 per Boe in 2019. See Note 9 for discussion of impairment of other property, plant and equipment. Costs Excluded from Amortization The costs excluded from amortization was related to unproved properties, which were excluded from oil and natural gas properties subject to amortization at December 31, 2021 and 2020 were $12.3 million and $18.0 million, respectively. For leases that do not have existing production that would otherwise extend the lease term, the Company estimates that any associated unproved costs will be evaluated and transferred to the amortization base of the full cost pool within a three to five year period from the original lease date. In addition, the Company’s internal engineers evaluate all properties on a quarterly basis.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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