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PROPERTY, PLANT AND EQUIPMENT | 6 Months Ended
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Jun. 30, 2020
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, 2020 |  | December 31, 2019
Land | $ | 139,859 |  |  | $ | 131,023 |
Asset retirement costs (non-landfill) | 16,102 |  |  | 15,924 |
Landfill assets | 182,287 |  |  | 182,276 |
Buildings and improvements (1) | 499,701 |  |  | 499,159 |
Camp equipment | 153,980 |  |  | 158,277 |
Vehicles (2) | 809,790 |  |  | 785,056 |
Equipment (3) | 1,776,574 |  |  | 1,779,366 |
Furniture and fixtures | 6,860 |  |  | 6,054 |
Construction in progress | 21,040 |  |  | 36,679 |
| 3,606,193 |  |  | 3,593,814 |
Less - accumulated depreciation and amortization | 2,052,385 |  |  | 2,005,663 |
Total property, plant and equipment, net | $ | 1,553,808 |  |  | $ | 1,588,151 |
________________ (1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.0 million and $31.0 million, respectively. (2) Balances inclusive of gross ROU assets classified as finance leases of $37.6 million and $2.4 million, respectively. (3) June 30, 2020 balance inclusive of gross ROU assets classified as finance leases of $3.3 million. 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. Depreciation expense, inclusive of landfill and finance lease amortization, was $65.5 million and $131.4 million for the three and six months ended June 30, 2019, 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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