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CLOSURE AND POST-CLOSURE LIABILITIES (Tables) | 12 Months Ended
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Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Closure and Post-Closure Liabilities | The changes to closure and post-closure liabilities (also referred to as "asset retirement obligations") from January 1, 2017 through December 31, 2018 were as follows (in thousands):
| Landfill Retirement Liability |  | Non-Landfill Retirement Liability |  | Total
Balance at January 1, 2017 | $ | 30,630 |  |  | $ | 27,701 |  |  | $ | 58,331 |
Liabilities assumed in acquisitions | — |  |  | 59 |  |  | 59 |
Measurement period adjustments from prior period acquisitions | — |  |  | 596 |  |  | 596 |
New asset retirement obligations | 1,881 |  |  | — |  |  | 1,881 |
Adjustment related to disposition of business | — |  |  | (1,170 | ) |  | (1,170 | )
Accretion | 2,243 |  |  | 2,505 |  |  | 4,748 |
Changes in estimates recorded to statement of operations | (131 | ) |  | (109 | ) |  | (240 | )
Changes in estimates recorded to balance sheet | 364 |  |  | (591 | ) |  | (227 | )
Expenditures | (2,777 | ) |  | (448 | ) |  | (3,225 | )
Currency translation and other | 172 |  |  | 112 |  |  | 284 |
Balance at December 31, 2017 | 32,382 |  |  | 28,655 |  |  | 61,037 |
Liabilities assumed in acquisitions | — |  |  | 685 |  |  | 685 |
New asset retirement obligations | 2,518 |  |  | — |  |  | 2,518 |
Accretion | 2,537 |  |  | 2,567 |  |  | 5,104 |
Changes in estimates recorded to statement of operations | (37 | ) |  | 1,497 |  |  | 1,460 |
Changes in estimates recorded to balance sheet | 1,867 |  |  | 64 |  |  | 1,931 |
Expenditures | (1,224 | ) |  | (1,057 | ) |  | (2,281 | )
Currency translation and other | (234 | ) |  | (289 | ) |  | (523 | )
Balance at December 31, 2018 | $ | 37,809 |  |  | $ | 32,122 |  |  | $ | 69,931 |
Schedule of Expected Payments Related to Asset Retirement Obligations | Anticipated payments (based on current estimated costs and anticipated timing of necessary regulatory approvals to commence work on closure and post-closure activities) for each of the next five years and thereafter are as follows (in thousands):
Year ending December 31, |
2019 | $ | 10,574 |
2020 | 9,424 |
2021 | 10,941 |
2022 | 7,626 |
2023 | 9,264 |
Thereafter | 271,314 |
Undiscounted closure and post-closure liabilities | 319,143 |
Less: Discount at credit-adjusted risk-free rate | (155,999 | )
Less: Undiscounted estimated closure and post-closure liabilities relating to airspace not yet consumed | (93,213 | )
Present value of closure and post-closure liabilities | $ | 69,931 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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