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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes to Goodwill | The changes in goodwill for the years ended December 31, 2020 and 2019 were as follows (in thousands):
| Environmental Services |  | Safety-Kleen |  | Totals
Balance at January 1, 2019 | $ | 207,019 |  |  | $ | 307,170 |  |  | $ | 514,189 |
Increase from current period acquisitions | 7,378 |  |  | 5,225 |  |  | 12,603 |
Measurement period adjustments from prior period acquisitions | (2,675) |  |  | (1,355) |  |  | (4,030) |
Foreign currency translation | 809 |  |  | 1,442 |  |  | 2,251 |
Balance at December 31, 2019 | $ | 212,531 |  |  | $ | 312,482 |  |  | $ | 525,013 |
Increase from current period acquisition | — |  |  | 1,439 |  |  | 1,439 |
Measurement period adjustments from prior period acquisitions | 23 |  |  | — |  |  | 23 |
Decrease from disposition of businesses | (674) |  |  | — |  |  | (674) |
Foreign currency translation | 506 |  |  | 716 |  |  | 1,222 |
Balance at December 31, 2020 | $ | 212,386 |  |  | $ | 314,637 |  |  | $ | 527,023 |
Schedule of Finite-Lived Intangible Assets by Major Class | As of December 31, 2020 and 2019, the Company's finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
| Cost |  | Accumulated Amortization |  | Net |  |  |  | Cost |  | Accumulated Amortization |  | Net |  |
Permits | $ | 183,766 |  |  | $ | 95,033 |  |  | $ | 88,733 |  |  |  |  | $ | 184,235 |  |  | $ | 87,228 |  |  | $ | 97,007 |  |  |
Customer and supplier relationships | 382,083 |  |  | 211,895 |  |  | 170,188 |  |  |  |  | 401,696 |  |  | 207,884 |  |  | 193,812 |  |  |
Other intangible assets | 39,287 |  |  | 34,744 |  |  | 4,543 |  |  |  |  | 38,331 |  |  | 33,018 |  |  | 5,313 |  |  |
Total amortizable permits and other intangible assets | 605,136 |  |  | 341,672 |  |  | 263,464 |  |  |  |  | 624,262 |  |  | 328,130 |  |  | 296,132 |  |  |
Trademarks and trade names | 123,156 |  |  | — |  |  | 123,156 |  |  |  |  | 122,934 |  |  | — |  |  | 122,934 |  |  |
Total permits and other intangible assets | $ | 728,292 |  |  | $ | 341,672 |  |  | $ | 386,620 |  |  |  |  | $ | 747,196 |  |  | $ | 328,130 |  |  | $ | 419,066 |  |  |
Schedule of Indefinite-Lived Intangible Assets | As of December 31, 2020 and 2019, the Company's finite-lived and indefinite-lived intangible assets consisted of the following (in thousands):
| December 31, 2020 |  | December 31, 2019
| Cost |  | Accumulated Amortization |  | Net |  |  |  | Cost |  | Accumulated Amortization |  | Net |  |
Permits | $ | 183,766 |  |  | $ | 95,033 |  |  | $ | 88,733 |  |  |  |  | $ | 184,235 |  |  | $ | 87,228 |  |  | $ | 97,007 |  |  |
Customer and supplier relationships | 382,083 |  |  | 211,895 |  |  | 170,188 |  |  |  |  | 401,696 |  |  | 207,884 |  |  | 193,812 |  |  |
Other intangible assets | 39,287 |  |  | 34,744 |  |  | 4,543 |  |  |  |  | 38,331 |  |  | 33,018 |  |  | 5,313 |  |  |
Total amortizable permits and other intangible assets | 605,136 |  |  | 341,672 |  |  | 263,464 |  |  |  |  | 624,262 |  |  | 328,130 |  |  | 296,132 |  |  |
Trademarks and trade names | 123,156 |  |  | — |  |  | 123,156 |  |  |  |  | 122,934 |  |  | — |  |  | 122,934 |  |  |
Total permits and other intangible assets | $ | 728,292 |  |  | $ | 341,672 |  |  | $ | 386,620 |  |  |  |  | $ | 747,196 |  |  | $ | 328,130 |  |  | $ | 419,066 |  |  |
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, 2020 is as follows (in thousands):
Years ending December 31, | Expected Amortization
2021 | $ | 30,163 |
2022 | 29,911 |
2023 | 25,587 |
2024 | 24,092 |
2025 | 23,121 |
Thereafter | 130,590 |
| $ | 263,464 |

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