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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables) | 9 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Summary of Financial Assets and Liabilities Measured at Fair Value | Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis follow:
| Fair Value Measurement at September 30, 2023 Using:
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |
Restricted investment securities - landfill closure | $ | 1,928 |  |  | $ | — |  |  | $ | — |
Interest rate swaps | — |  |  | 16,357 |  |  | — |
| $ | 1,928 |  |  | $ | 16,357 |  |  | $ | — |
Liabilities: |  |  |  |  |
Interest rate swaps | — |  |  | 1,886 |  |  | — |
| $ | — |  |  | $ | 1,886 |  |  | $ | — |
| Fair Value Measurement at December 31, 2022 Using:
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |
Restricted investment securities - landfill closure | $ | 1,900 |  |  | $ | — |  |  | $ | — |
Interest rate swaps | — |  |  | 11,806 |  |  | — |
| $ | 1,900 |  |  | $ | 11,806 |  |  | $ | — |
Liabilities: |  |  |  |  |
Contingent consideration - acquisition (1) | $ | — |  |  | $ | — |  |  | $ | 965 |
(1)In the three and nine months ended September 30, 2023, we recorded a gain on resolution of acquisition-related contingent consideration of $376 and $965, respectively, within cost of operations associated with the reversal of a contingency for a transfer station permit expansion that is no longer deemed viable.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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