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PROPERTY, PLANT AND EQUIPMENT | 3 Months Ended
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Mar. 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):
| March 31, 2022 |  | December 31, 2021
Land | $ | 174,480 |  |  | $ | 165,010 |
Asset retirement costs (non-landfill) | 19,154 |  |  | 19,105 |
Landfill assets | 208,481 |  |  | 205,873 |
Buildings and improvements (1) | 568,493 |  |  | 551,795 |
Camp equipment | 129,304 |  |  | 127,680 |
Vehicles (2) | 926,148 |  |  | 912,836 |
Equipment (3) | 2,116,923 |  |  | 2,092,395 |
Furniture and fixtures | 6,390 |  |  | 6,444 |
Construction in progress | 75,578 |  |  | 60,447 |
| 4,224,951 |  |  | 4,141,585 |
Less - accumulated depreciation and amortization | 2,343,409 |  |  | 2,278,410 |
Total property, plant and equipment, net | $ | 1,881,542 |  |  | $ | 1,863,175 |
________________ (1) Balances inclusive of gross right-of-use ("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 $82.4 million and $77.7 million, respectively. (3) Balances inclusive of gross ROU assets classified as finance leases of $9.3 million in both periods. Depreciation expense, inclusive of landfill and finance lease amortization, was $72.1 million and $64.6 million for the three months ended March 31, 2022 and 2021, respectively.

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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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