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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes to Goodwill | The changes in goodwill for the years ended December 31, 2024 and 2023 were as follows (in thousands):
| Environmental Services |  | Safety-Kleen Sustainability Solutions |  | Total
Balance at January 1, 2023 | $ | 1,071,846 |  |  | $ | 175,032 |  |  | $ | 1,246,878 |
Increase from current period acquisitions | 39,346 |  |  | — |  |  | 39,346 |
Measurement period adjustments from prior period acquisition | — |  |  | 360 |  |  | 360 |
Foreign currency translation | 821 |  |  | 331 |  |  | 1,152 |
Balance at December 31, 2023 | $ | 1,112,013 |  |  | $ | 175,723 |  |  | $ | 1,287,736 |
Increase from current period acquisitions | 186,911 |  |  | 6,457 |  |  | 193,368 |
Measurement period adjustments from prior period acquisitions | 218 |  |  | — |  |  | 218 |
Foreign currency translation | (2,938) |  |  | (1,185) |  |  | (4,123) |
Balance at December 31, 2024 | $ | 1,296,204 |  |  | $ | 180,995 |  |  | $ | 1,477,199 |
Schedule of Finite-Lived Intangible Assets by Major Class | As of December 31, 2024 and 2023, the Company's intangible assets consisted of the following (in thousands):
| December 31, 2024 |  |  |  | December 31, 2023
| Cost |  | Accumulated Amortization |  | Net |  |  |  | Cost |  | Accumulated Amortization |  | Net |  |
Permits | $ | 191,921 |  |  | $ | 123,939 |  |  | $ | 67,982 |  |  |  |  | $ | 191,747 |  |  | $ | 117,556 |  |  | $ | 74,191 |  |  |
Customer and supplier relationships | 697,326 |  |  | 256,657 |  |  | 440,669 |  |  |  |  | 604,994 |  |  | 258,879 |  |  | 346,115 |  |  |
Other intangible assets | 120,316 |  |  | 46,490 |  |  | 73,826 |  |  |  |  | 100,068 |  |  | 37,862 |  |  | 62,206 |  |  |
Total amortizable permits and other intangible assets | 1,009,563 |  |  | 427,086 |  |  | 582,477 |  |  |  |  | 896,809 |  |  | 414,297 |  |  | 482,512 |  |  |
Trademarks and trade names | 119,510 |  |  | — |  |  | 119,510 |  |  |  |  | 120,285 |  |  | — |  |  | 120,285 |  |  |
Total permits and other intangible assets | $ | 1,129,073 |  |  | $ | 427,086 |  |  | $ | 701,987 |  |  |  |  | $ | 1,017,094 |  |  | $ | 414,297 |  |  | $ | 602,797 |  |  |
Schedule of Indefinite-Lived Intangible Assets | As of December 31, 2024 and 2023, the Company's intangible assets consisted of the following (in thousands):
| December 31, 2024 |  |  |  | December 31, 2023
| Cost |  | Accumulated Amortization |  | Net |  |  |  | Cost |  | Accumulated Amortization |  | Net |  |
Permits | $ | 191,921 |  |  | $ | 123,939 |  |  | $ | 67,982 |  |  |  |  | $ | 191,747 |  |  | $ | 117,556 |  |  | $ | 74,191 |  |  |
Customer and supplier relationships | 697,326 |  |  | 256,657 |  |  | 440,669 |  |  |  |  | 604,994 |  |  | 258,879 |  |  | 346,115 |  |  |
Other intangible assets | 120,316 |  |  | 46,490 |  |  | 73,826 |  |  |  |  | 100,068 |  |  | 37,862 |  |  | 62,206 |  |  |
Total amortizable permits and other intangible assets | 1,009,563 |  |  | 427,086 |  |  | 582,477 |  |  |  |  | 896,809 |  |  | 414,297 |  |  | 482,512 |  |  |
Trademarks and trade names | 119,510 |  |  | — |  |  | 119,510 |  |  |  |  | 120,285 |  |  | — |  |  | 120,285 |  |  |
Total permits and other intangible assets | $ | 1,129,073 |  |  | $ | 427,086 |  |  | $ | 701,987 |  |  |  |  | $ | 1,017,094 |  |  | $ | 414,297 |  |  | $ | 602,797 |  |  |
Schedule of Expected Amortization for the Net Carrying Amount of Finite Lived Intangible Assets | The expected amortization of the net carrying amount of finite-lived intangible assets at December 31, 2024 was as follows (in thousands):
Years ending December 31, | Expected Amortization
2025 | $ | 53,335 |
2026 | 51,297 |
2027 | 49,221 |
2028 | 47,916 |
2029 | 46,763 |
Thereafter | 333,945 |
| $ | 582,477 |

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