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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 A summary of property, plant and equipment is as follows:
| December 31, |  |
| 2019 |  | 2018
Land | $ | 28,703 |  |  | $ | 25,490 |
Landfills | 578,814 |  |  | 544,663 |
Landfill operating lease contracts (1) | — |  |  | 121,877 |
Finance lease right-of-use assets (2) | 24,038 |  |  | — |
Buildings and improvements | 161,316 |  |  | 150,885 |
Machinery and equipment | 168,735 |  |  | 153,222 |
Rolling stock | 183,145 |  |  | 163,758 |
Containers | 143,948 |  |  | 123,383 |
| 1,288,699 |  |  | 1,283,278 |
Less: accumulated depreciation and amortization (1) | (844,874) |  |  | (878,701) |
| $ | 443,825 |  |  | $ | 404,577 |
(1)Upon the adoption of Topic 842 effective January 1, 2019, landfill operating lease contracts payments that were previously capitalized as property, plant and equipment were prospectively reclassified, along with related accumulated depreciation, to operating lease right-of-use assets. (2)Upon the adoption of Topic 842 effective January 1, 2019, property, plant and equipment pertaining to finance leases that were previously capitalized in other property, plant and equipment groupings were prospectively reclassified to finance lease right-of-use assets. Depreciation expense for fiscal years 2019, 2018 and 2017 was $45,060, $35,351 and $32,131, respectively. Landfill amortization expense for fiscal years 2019, 2018 and 2017 was $27,512, $31,841 and $27,910, respectively. Depletion expense on landfill operating lease contracts for fiscal years 2018 and 2017 was $9,724 and $9,646, respectively, and was recorded in cost of operations. See Note 8, Leases for further disclosure over lease costs and other lease information.

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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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