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GOODWILL AND OTHER INTANGIBLE ASSETS (Changes to Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | $ 478,523 | $ 465,154 |
Increase from current period acquisitions | 40,704 | 8,687 |
Measurement period adjustments from prior period acquisitions | (78) | 2,186 |
Decrease from disposition of business |  | (1,300) |
Goodwill impairment charge | 0 | 0 | $ (34,013)
Foreign currency translation | (4,960) | 3,796 |
Goodwill, end of period | 514,189 | 478,523 | 465,154
Environmental Services |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 172,386 | 169,084 |
Increase from current period acquisitions | 37,007 | 3,000 |
Measurement period adjustments from prior period acquisitions | (78) | 0 |
Decrease from disposition of business |  | (1,300) |
Foreign currency translation | (2,296) | 1,602 |
Goodwill, end of period | 207,019 | 172,386 | 169,084
Safety-Kleen |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, beginning of period | 306,137 | 296,070 |
Increase from current period acquisitions | 3,697 | 5,687 |
Measurement period adjustments from prior period acquisitions | 0 | 2,186 |
Decrease from disposition of business |  | 0 |
Foreign currency translation | (2,664) | 2,194 |
Goodwill, end of period | $ 307,170 | $ 306,137 | $ 296,070

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