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SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | $ 230,095 | $ 215,138
Reconciliation to Consolidated Statements of Operations: |  |
Accretion of environmental liabilities | 3,217 | 3,407
Stock-based compensation | 6,338 | 6,018
Depreciation and amortization | 95,065 | 84,758
Income from operations | 125,475 | 120,955
Other expense (income), net | 1,141 | (116)
Loss on early extinguishment of debt | 0 | 2,362
Interest expense, net of interest income | 28,539 | 20,632
Income before provision for income taxes | 95,795 | 98,077
Operating Segments | Environmental Services |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | 264,475 | 228,345
Operating Segments | Safety-Kleen Sustainability Solutions |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | 29,700 | 41,463
Corporate |  |
Segment Reporting Information [Line Items] |  |
Adjusted EBITDA | $ (64,080) | $ (54,670)

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