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PROPERTY, PLANT, AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT, AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following (in thousands):
| December 31, 2022 |  | December 31, 2021
Land | $ | 172,579 |  |  | $ | 165,010 |
Asset retirement costs (non-landfill) | 22,001 |  |  | 19,105 |
Landfill assets | 232,872 |  |  | 205,873 |
Buildings and improvements (1) | 584,916 |  |  | 551,795 |
Camp equipment | 116,976 |  |  | 127,680 |
Vehicles (2) | 1,112,188 |  |  | 912,836 |
Equipment (3) | 2,078,088 |  |  | 2,092,395 |
Furniture and fixtures | 6,481 |  |  | 6,444 |
Construction in progress | 140,328 |  |  | 60,447 |
| 4,466,429 |  |  | 4,141,585 |
Less - accumulated depreciation and amortization | 2,486,127 |  |  | 2,278,410 |
Total property, plant and equipment, net | $ | 1,980,302 |  |  | $ | 1,863,175 |
___________________________________ (1) Balances inclusive of gross ROU assets classified as finance leases of $8.0 million and $8.9 million, respectively. (2) Balances inclusive of gross ROU assets classified as finance leases of $106.7 million and $77.7 million, respectively. (3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million and $9.3 million, respectively. Depreciation expense, inclusive of landfill and finance lease amortization was $297.4 million, $263.4 million and $257.1 million for the years ended December 31, 2022, 2021 and 2020, respectively. The Company recorded $3.4 million of capitalized interest in 2022, mainly attributable to the construction of a new incinerator in Kimball, Nebraska. Capitalized interest in 2021 and 2020 was negligible.

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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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://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 https://asc.fasb.org/extlink&oid=126982197&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 https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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