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GOODWILL AND OTHER INTANGIBLE ASSETS (Changes to Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | $ 525,013 | $ 514,189
Increase from current period acquisitions | 1,439 | 12,603
Measurement period adjustments from prior period acquisitions | 23 | (4,030)
Decrease from disposition of businesses | (674) |
Foreign currency translation | 1,222 | 2,251
Goodwill, end of period | 527,023 | 525,013
Environmental Services |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 212,531 | 207,019
Increase from current period acquisitions | 0 | 7,378
Measurement period adjustments from prior period acquisitions | 23 | (2,675)
Decrease from disposition of businesses | (674) |
Foreign currency translation | 506 | 809
Goodwill, end of period | 212,386 | 212,531
Safety-Kleen |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 312,482 | 307,170
Increase from current period acquisitions | 1,439 | 5,225
Measurement period adjustments from prior period acquisitions | 0 | (1,355)
Decrease from disposition of businesses | 0 |
Foreign currency translation | 716 | 1,442
Goodwill, end of period | $ 314,637 | $ 312,482

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