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SEGMENT REPORTING - Adjusted EBITDA Information (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | $ 122,590 | $ 101,663
Reconciliation to Consolidated Statements of Operations: |  |
Accretion of environmental liabilities | 2,561 | 2,574
Depreciation and amortization | 74,533 | 75,355
Income from operations | 45,496 | 23,734
Other expense (income), net | 2,365 | (2,983)
Loss on sale of businesses | 3,074 | 0
Interest expense, net of interest income | 18,787 | 19,764
Income before provision for income taxes | 21,270 | 6,953
Operating segments | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | 108,914 | 89,510
Operating segments | Safety-Kleen |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | 61,148 | 54,793
Corporate Items |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | $ (47,472) | $ (42,640)

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