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PROPERTY, PLANT AND EQUIPMENT | 3 Months Ended
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Mar. 31, 2021
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, 2021 |  | December 31, 2020
Land | $ | 145,662 |  |  | $ | 139,776 |
Asset retirement costs (non-landfill) | 17,747 |  |  | 16,407 |
Landfill assets | 193,009 |  |  | 191,687 |
Buildings and improvements (1) | 514,711 |  |  | 509,804 |
Camp equipment | 158,281 |  |  | 159,021 |
Vehicles (2) | 855,842 |  |  | 844,026 |
Equipment (3) | 1,812,858 |  |  | 1,807,235 |
Furniture and fixtures | 6,992 |  |  | 7,082 |
Construction in progress | 39,943 |  |  | 24,378 |
| 3,745,045 |  |  | 3,699,416 |
Less - accumulated depreciation and amortization | 2,217,101 |  |  | 2,174,118 |
Total property, plant and equipment, net | $ | 1,527,944 |  |  | $ | 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 of $56.4 million and $47.2 million, respectively. (3) Balances inclusive of gross ROU assets classified as finance leases of $9.4 million and $9.3 million, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $64.6 million and $65.4 million for the three months ended March 31, 2021 and March 31, 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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