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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property Plant And Equipment [Abstract] |
Property, Plant and Equipment | 3. Property, Plant and Equipment
|  | Average |  | December 31, |
|  | useful lives (1) |  | 2020 |  |  | 2019 |
|  |  |  | (In Thousands) |
Machinery, equipment and automotive |  | 25 |  | $ | 1,213,359 |  |  | $ | 1,204,695 |
Buildings and improvements |  | 26 |  |  | 44,123 |  |  |  | 38,810 |
Land improvements |  | 34 |  |  | 8,223 |  |  |  | 8,223 |
Furniture, fixtures and store equipment |  | 5 |  |  | 1,080 |  |  |  | 1,122 |
Construction in progress |  | N/A |  |  | 18,389 |  |  |  | 31,575 |
Capital spare parts |  | N/A |  |  | 26,894 |  |  |  | 24,245 |
Land |  | N/A |  |  | 4,567 |  |  |  | 4,575 |
|  |  |  |  | 1,316,635 |  |  |  | 1,313,245 |
Less accumulated depreciation and amortization |  |  |  |  | 425,437 |  |  |  | 376,771 |
|  |  |  | $ | 891,198 |  |  | $ | 936,474 |
| (1) | Weighted average useful lives as of December 31, 2020.
Machinery, equipment and automotive primarily includes the categories of property and equipment and estimated useful lives as follows: processing plants and plant infrastructure (15-30 years); certain processing plant components (3-10 years); and trucks, automobiles, trailers, and other rolling stock (2-7 years).

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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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