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CLOSURE AND POST-CLOSURE LIABILITIES (Changes in Post-Closure Liabilities) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) landfill_site | Dec. 31, 2019 USD ($)
Changes to post-closure liabilities |  |
Balance at the beginning of the period | $ 75,651 | $ 69,931
Liabilities assumed in acquisitions | 265 | 220
New asset retirement obligations | 2,101 | 2,705
Accretion | 6,653 | 5,601
Changes in estimates recorded to consolidated statement of operations | 6,568 | 2,685
Changes in estimates recorded to consolidated balance sheet | 682 | 3,865
Expenditures | (4,198) | (9,839)
Currency translation and other | 204 | 483
Balance at the end of the period | $ 87,926 | 75,651
Number of landfill sites closed during period | landfill_site | 2 |
Environmental remediation expense | $ 6,800 |
Increase in facility closure costs |  | 2,300
Landfill Retirement Liability |  |
Changes to post-closure liabilities |  |
Balance at the beginning of the period | 39,401 | 37,809
Liabilities assumed in acquisitions | 0 | 0
New asset retirement obligations | 2,101 | 2,705
Accretion | 3,254 | 2,772
Changes in estimates recorded to consolidated statement of operations | 6,465 | 248
Changes in estimates recorded to consolidated balance sheet | 481 | 3,303
Expenditures | (3,445) | (7,718)
Currency translation and other | 155 | 282
Balance at the end of the period | 48,412 | 39,401
Non-Landfill Retirement Liability |  |
Changes to post-closure liabilities |  |
Balance at the beginning of the period | 36,250 | 32,122
Liabilities assumed in acquisitions | 265 | 220
New asset retirement obligations | 0 | 0
Accretion | 3,399 | 2,829
Changes in estimates recorded to consolidated statement of operations | 103 | 2,437
Changes in estimates recorded to consolidated balance sheet | 201 | 562
Expenditures | (753) | (2,121)
Currency translation and other | 49 | 201
Balance at the end of the period | $ 39,514 | $ 36,250

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- Definition Represents the amount of change in the asset retirement obligation, during the current period for other changes in estimates recorded in the balance sheet. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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