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SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | $ 180,259 | $ 129,451
Reconciliation to Consolidated Statements of Operations: |  |
Accretion of environmental liabilities | 3,156 | 2,953
Stock-based compensation | 5,712 | 3,480
Depreciation and amortization | 84,298 | 72,163
Income from operations | 87,093 | 50,855
Other (income) expense, net | (704) | 1,228
Interest expense, net of interest income | 25,017 | 17,918
Income before provision for income taxes | 62,780 | 31,709
Operating segments | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | 183,602 | 140,254
Operating segments | Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | 51,877 | 31,632
Corporate |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | $ (55,220) | $ (42,435)

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