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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2019
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, |  |
| 2019 |  | 2018
Oil and natural gas properties |  |  |
Proved | $ | 1,484,359 |  |  | $ | 1,269,091 |
Unproved | 24,603 |  |  | 60,152 |
Total oil and natural gas properties | 1,508,962 |  |  | 1,329,243 |
Less accumulated depreciation, depletion and impairment | (1,129,622) |  |  | (580,132) |
Net oil and natural gas properties capitalized costs | 379,340 |  |  | 749,111 |
Land | 4,400 |  |  | 4,400 |
Electrical infrastructure | 126,482 |  |  | 131,176 |
Non-oil and natural gas equipment | 12,665 |  |  | 13,458 |
Buildings and structures | 77,148 |  |  | 77,148 |
Financing Leases | 2,109 |  |  | — |
Total | 222,804 |  |  | 226,182 |
Less accumulated depreciation and amortization | (34,201) |  |  | (25,344) |
Other property, plant and equipment, net | 188,603 |  |  | 200,838 |
Total property, plant and equipment, net | $ | 567,943 |  |  | $ | 949,949 |
The average rates used for depreciation and depletion of oil and natural gas properties were $12.28 per Boe in 2019, $10.32 per Boe in 2018 and $7.92 per Boe in 2017. See Note 9 for discussion of impairment of other property, plant and equipment. Costs Excluded from Amortization The following table summarizes the costs, by year incurred, related to unproved properties, which were excluded from oil and natural gas properties subject to amortization at December 31, 2019 (in thousands):
|  |  | Year Cost Incurred |  |  |  |  |  |
| Total |  | 2019 |  | 2018 |  | 2017 |  | 2016 and Prior
Property acquisition | $ | 23,973 |  |  | $ | 2,653 |  |  | $ | 2,353 |  |  | $ | 4,280 |  |  | $ | 14,687 |
Exploration | 630 |  |  | 10 |  |  | 16 |  |  | 564 |  |  | 40 |
Total costs incurred | $ | 24,603 |  |  | $ | 2,663 |  |  | $ | 2,369 |  |  | $ | 4,844 |  |  | $ | 14,727 |
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. For leases that are held by production, the Company estimates that any associated unproved costs will be evaluated and transferred to the amortization base of the full cost pool within a 10-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 assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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