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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Components of Property, Plant and Equipment | We provide for depreciation and amortization using the straight-line method by charges to operations in amounts that allocate the cost of the assets over their estimated useful lives as follows:
Asset Classification |  | Estimated Useful Life
Buildings and improvements |  | 10-30 years
Machinery and equipment |  | 5-10 years
Rolling stock |  | 5-10 years
Containers |  | 5-12 years
Furniture and Fixtures |  | 3-8 years
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.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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