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CLOSURE AND POST-CLOSURE LIABILITIES | 6 Months Ended
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Jun. 30, 2021
Asset Retirement Obligation Disclosure [Abstract] |
CLOSURE AND POST-CLOSURE LIABILITIES | CLOSURE AND POST-CLOSURE LIABILITIES The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, 2021 through June 30, 2021 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2021 | $ | 48,412 |  |  | $ | 39,514 |  |  | $ | 87,926 |
Liabilities assumed in acquisitions | — |  |  | 451 |  |  | 451 |
New asset retirement obligations | 1,342 |  |  | — |  |  | 1,342 |
Accretion | 1,781 |  |  | 1,844 |  |  | 3,625 |
Changes in estimates recorded to consolidated statement of operations | — |  |  | 300 |  |  | 300 |
Changes in estimates recorded to consolidated balance sheet | — |  |  | 1,137 |  |  | 1,137 |
Expenditures | (1,163) |  |  | (319) |  |  | (1,482) |
Currency translation and other | 153 |  |  | 42 |  |  | 195 |
Balance at June 30, 2021 | $ | 50,525 |  |  | $ | 42,969 |  |  | $ | 93,494 |
In the six months ended June 30, 2021, there were no significant charges (benefits) resulting from changes in estimates for closure and post-closure liabilities. New asset retirement obligations incurred during the first six months of 2021 were discounted at the credit-adjusted risk-free rate of 4.84%.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service 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 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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