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SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ 185,084 | $ 167,833 | $ 502,306 | $ 431,980
Reconciliation of Net Income to Adjusted EBITDA [Abstract] |  |  |  |
Accretion of environmental liabilities | 2,799 | 2,822 | 8,625 | 8,149
Stock-based compensation | 6,001 | 6,662 | 12,786 | 12,739
Depreciation and amortization | 71,451 | 74,470 | 215,206 | 221,497
Income from operations | 104,833 | 83,879 | 265,689 | 189,595
Other (income) expense, net | (199) | (2,268) | 2,509 | 597
Loss on sale of businesses | 0 | 118 | 0 | 3,376
Interest expense, net of interest income | 17,984 | 17,407 | 53,953 | 54,848
Income before provision for income taxes | 87,048 | 68,622 | 209,227 | 130,774
Operating segments | Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 166,471 | 180,002 | 482,766 | 502,101
Operating segments | Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 70,810 | 29,613 | 165,756 | 62,248
Corporate, non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ (52,197) | $ (41,782) | $ (146,216) | $ (132,369)

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