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PROPERTY, PLANT, AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT, AND EQUIPMENT | PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following (in thousands):
| December 31, 2019 |  | December 31, 2018
Land | $ | 131,023 |  |  | $ | 123,734 |
Asset retirement costs (non-landfill) | 15,924 |  |  | 15,148 |
Landfill assets | 182,276 |  |  | 154,918 |
Buildings and improvements (1) | 499,159 |  |  | 440,188 |
Camp and lodging equipment | 158,277 |  |  | 152,998 |
Vehicles (1) | 785,056 |  |  | 721,735 |
Equipment | 1,779,366 |  |  | 1,697,490 |
Furniture and fixtures | 6,054 |  |  | 5,453 |
Construction in progress | 36,679 |  |  | 20,931 |
| 3,593,814 |  |  | 3,332,595 |
Less - accumulated depreciation and amortization | 2,005,663 |  |  | 1,770,617 |
Total property, plant and equipment, net | $ | 1,588,151 |  |  | $ | 1,561,978 |
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(1) | December 31, 2019 balances inclusive of ROU assets classified as finance leases.
Depreciation expense, inclusive of landfill and finance lease amortization was $265.5 million, $264.3 million and $251.4 million for the years ended December 31, 2019, 2018 and 2017, 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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