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PROPERTY, PLANT AND EQUIPMENT | 6 Months Ended
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Jun. 30, 2023
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, 2023 |  | December 31, 2022
Land | $ | 174,235 |  |  | $ | 172,579 |
Asset retirement costs (non-landfill) | 27,164 |  |  | 22,001 |
Landfill assets | 244,639 |  |  | 232,872 |
Buildings and improvements (1) | 617,189 |  |  | 591,397 |
Vehicles (2) | 1,174,004 |  |  | 1,112,188 |
Equipment (3) | 2,307,666 |  |  | 2,195,064 |
Construction in progress | 170,120 |  |  | 140,328 |
| 4,715,017 |  |  | 4,466,429 |
Less - accumulated depreciation and amortization | 2,632,324 |  |  | 2,486,127 |
Total property, plant and equipment, net | $ | 2,082,693 |  |  | $ | 1,980,302 |
________________ (1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.0 million in both periods. (2) Balances inclusive of gross ROU assets classified as finance leases of $120.8 million and $106.7 million, respectively. (3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million in both periods. Depreciation expense, inclusive of landfill and finance lease amortization, was $77.2 million and $149.2 million for the three and six months ended June 30, 2023, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $75.6 million and $147.7 million for the three and six months ended June 30, 2022, respectively. The Company recorded $1.4 million and $2.7 million of capitalized interest during the three and six months ended June 30, 2023, respectively. The Compan y recorded $0.7 million and $1.1 million of capitalized interest during the three and six months ended June 30, 2022, respectively. The capitalized interest in the periods is mainly due to the construction of a new incinerator in Kimball, Nebraska.

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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://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//360/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 6 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 7 -SubTopic 360 -Topic 958 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480321/958-360-50-7 + Details
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