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GOODWILL AND OTHER INTANGIBLE ASSETS (Changes to Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | $ 514,189 | $ 478,523
Increase from current period acquisitions | 12,603 | 40,704
Measurement period adjustments from prior period acquisitions | (4,030) | (78)
Decrease from disposition of business |  | 0
Foreign currency translation | 2,251 | (4,960)
Goodwill, end of period | 525,013 | 514,189
Environmental Services |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 207,019 | 172,386
Increase from current period acquisitions | 7,378 | 37,007
Measurement period adjustments from prior period acquisitions | (2,675) | (78)
Decrease from disposition of business |  | 0
Foreign currency translation | 809 | (2,296)
Goodwill, end of period | 212,531 | 207,019
Safety-Kleen |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning of period | 307,170 | 306,137
Increase from current period acquisitions | 5,225 | 3,697
Measurement period adjustments from prior period acquisitions | (1,355) | 0
Decrease from disposition of business |  | 0
Foreign currency translation | 1,442 | (2,664)
Goodwill, end of period | $ 312,482 | $ 307,170

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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