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PROPERTY, PLANT, AND EQUIPMENT (Tables) | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Schedule of Property, Plant and Equipment | The Company depreciates and amortizes the capitalized cost of these assets, using the straight-line method as follows:
Asset Classification |  | Estimated Useful Life
Buildings and building improvements |  |
Buildings |  | 20-42 years
Leasehold and building improvements |  | 2-45 years
Camp and lodging equipment |  | 8-15 years
Vehicles |  | 2-15 years
Equipment |  |
Capitalized software and computer equipment |  | 3-5 years
Containers and railcars |  | 8-16 years
All other equipment |  | 4-30 years
Furniture and fixtures |  | 5-8 years
Property, plant and equipment consisted of the following (in thousands):
| December 31, 2021 |  | December 31, 2020
Land | $ | 165,010 |  |  | $ | 139,776 |
Asset retirement costs (non-landfill) | 19,105 |  |  | 16,407 |
Landfill assets | 205,873 |  |  | 191,687 |
Buildings and improvements (1) | 551,795 |  |  | 509,804 |
Camp equipment | 127,680 |  |  | 159,021 |
Vehicles (2) | 912,836 |  |  | 844,026 |
Equipment (3) | 2,092,395 |  |  | 1,807,235 |
Furniture and fixtures | 6,444 |  |  | 7,082 |
Construction in progress | 60,447 |  |  | 24,378 |
| 4,141,585 |  |  | 3,699,416 |
Less - accumulated depreciation and amortization | 2,278,410 |  |  | 2,174,118 |
Total property, plant and equipment, net | $ | 1,863,175 |  |  | $ | 1,525,298 |
___________________________________ (1) Balances inclusive of gross ROU assets classified as finance leases of $8.9 million in both periods. (2) Balances inclusive of gross ROU assets classified as finance leases of $77.7 million and $47.2 million, respectively. (3) Balances inclusive of gross ROU assets classified as finance leases of $9.3 million both periods.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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