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PROPERTY, PLANT AND EQUIPMENT | 6 Months Ended
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Jun. 30, 2021
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following (in thousands):
| June 30, 2021 |  | December 31, 2020
Land | $ | 148,749 |  |  | $ | 139,776 |
Asset retirement costs (non-landfill) | 17,851 |  |  | 16,407 |
Landfill assets | 196,156 |  |  | 191,687 |
Buildings and improvements (1) | 523,136 |  |  | 509,804 |
Camp equipment | 157,554 |  |  | 159,021 |
Vehicles (2) | 867,498 |  |  | 844,026 |
Equipment (3) | 1,821,298 |  |  | 1,807,235 |
Furniture and fixtures | 7,195 |  |  | 7,082 |
Construction in progress | 44,555 |  |  | 24,378 |
| 3,783,992 |  |  | 3,699,416 |
Less - accumulated depreciation and amortization | 2,252,703 |  |  | 2,174,118 |
Total property, plant and equipment, net | $ | 1,531,289 |  |  | $ | 1,525,298 |
________________ (1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.9 million in both periods. (2) Balances inclusive of gross ROU assets classified as finance leases o f $66.0 million and $47.2 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 $63.8 million and $128.4 million for the three and six months ended June 30, 2021, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $63.7 million and $129.0 million for the three and six months ended June 30, 2020, 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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