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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2020
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,
| 2020 |  | 2019
Land | $ | 30,061 |  |  | $ | 28,703 |
Landfills | 635,144 |  |  | 578,814 |
Finance lease right-of-use assets | 39,683 |  |  | 24,038 |
Buildings and improvements | 169,325 |  |  | 161,316 |
Machinery and equipment | 178,104 |  |  | 168,735 |
Rolling stock | 204,333 |  |  | 183,145 |
Containers | 154,744 |  |  | 143,948 |
| 1,411,394 |  |  | 1,288,699 |
Less: accumulated depreciation and amortization | (900,882) |  |  | (844,874) |
| $ | 510,512 |  |  | $ | 443,825 |
Depreciation expense for fiscal years 2020, 2019 and 2018 was $54,370, $45,060 and $35,351, respectively. Landfill amortization expense for fiscal years 2020, 2019 and 2018 was $27,520, $27,512 and $31,841, 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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