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BUSINESS COMBINATIONS - 2018 Acquisitions (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2018 | Feb. 23, 2018 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |
Goodwill recognized |  |  |  | $ 12,536 |
Acquired Company Included in Safety-Kleen and Environmental Services Segments |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill recognized | $ 12,300 |  |  |  |
Purchase price | $ 26,700 |  |  |  |
Veolia Division |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price |  | $ 124,500 |  |  |
Weighted average amortization period (in years) |  | 8 years 2 months 12 days |  |  |
Pre-tax income |  |  | $ 2,100 |  | $ 3,300

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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