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CLOSURE AND POST-CLOSURE LIABILITIES | 9 Months Ended
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Sep. 30, 2018
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, 2018 through September 30, 2018 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2018 | $ | 32,382 |  |  | $ | 28,655 |  |  | $ | 61,037 |
Liabilities assumed in acquisition | — |  |  | 354 |  |  | 354 |
New asset retirement obligations | 2,052 |  |  | — |  |  | 2,052 |
Accretion | 1,898 |  |  | 1,897 |  |  | 3,795 |
Changes in estimates recorded to statement of operations | — |  |  | 400 |  |  | 400 |
Changes in estimates recorded to balance sheet | 871 |  |  | 64 |  |  | 935 |
Expenditures | (787 | ) |  | (269 | ) |  | (1,056 | )
Currency translation and other | (79 | ) |  | (57 | ) |  | (136 | )
Balance at September 30, 2018 | $ | 36,337 |  |  | $ | 31,044 |  |  | $ | 67,381 |
All of the landfill facilities included in the above were active as of September 30, 2018. There were no significant charges (benefits) in 2018 resulting from changes in estimates for closure and post-closure liabilities. New asset retirement obligations incurred during the first nine months of 2018 were discounted at the credit-adjusted risk-free rate of 5.66%.

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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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