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PROPERTY, PLANT AND EQUIPMENT | 12 Months Ended
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Dec. 31, 2018
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,
| 2018 |  | 2017
Land | $ | 25,490 |  |  | $ | 24,224 |
Landfills | 544,663 |  |  | 513,548 |
Landfill operating lease contracts | 121,877 |  |  | 114,462 |
Buildings and improvements | 150,885 |  |  | 140,155 |
Machinery and equipment | 153,222 |  |  | 139,029 |
Rolling stock | 163,758 |  |  | 138,102 |
Containers | 123,383 |  |  | 103,501 |
| 1,283,278 |  |  | 1,173,021 |
Less: accumulated depreciation and amortization | (878,701 | ) |  | (811,474 | )
| $ | 404,577 |  |  | $ | 361,547 |
Depreciation expense for fiscal years 2018, 2017 and 2016 was $35,351, $32,131 and $33,186, respectively. Landfill amortization expense for fiscal years 2018, 2017 and 2016 was $31,841, $27,910 and $26,529, respectively. Depletion expense on landfill operating lease contracts for fiscal years 2018, 2017 and 2016 was $9,724, $9,646 and $9,295, respectively, and was recorded in cost of operations.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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