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PROPERTY, PLANT AND EQUIPMENT | 3 Months Ended
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Mar. 31, 2020
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, 2020 |  | December 31, 2019
Land | $ | 134,483 |  |  | $ | 131,023 |
Asset retirement costs (non-landfill) | 15,863 |  |  | 15,924 |
Landfill assets | 179,217 |  |  | 182,276 |
Buildings and improvements (1) | 491,415 |  |  | 499,159 |
Camp equipment | 150,279 |  |  | 158,277 |
Vehicles (2) | 782,669 |  |  | 785,056 |
Equipment | 1,743,261 |  |  | 1,779,366 |
Furniture and fixtures | 6,804 |  |  | 6,054 |
Construction in progress | 23,289 |  |  | 36,679 |
| 3,527,280 |  |  | 3,593,814 |
Less - accumulated depreciation and amortization | 1,980,161 |  |  | 2,005,663 |
Total property, plant and equipment, net | $ | 1,547,119 |  |  | $ | 1,588,151 |
________________ (1) Balances inclusive of gross 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 $23.5 million and $2.4 million, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $65.4 million and $65.9 million for the three months ended March 31, 2020 and March 31, 2019, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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