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SEGMENT REPORTING - Reconciliation to Consolidated Statements of Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ 187,771 | $ 138,266 | $ 317,222 | $ 264,147
Reconciliation of Net Income to Adjusted EBITDA [Abstract] |  |  |  |
Accretion of environmental liabilities | 2,873 | 2,766 | 5,826 | 5,327
Stock-based compensation | 3,305 | 2,786 | 6,785 | 6,077
Depreciation and amortization | 71,592 | 72,494 | 143,755 | 147,027
Income from operations | 110,001 | 60,220 | 160,856 | 105,716
Other expense, net | 1,480 | 500 | 2,708 | 2,865
Loss on sale of businesses | 0 | 184 | 0 | 3,258
Interest expense, net of interest income | 18,051 | 18,654 | 35,969 | 37,441
Income before provision for income taxes | 90,470 | 40,882 | 122,179 | 62,152
Operating segments | Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 176,041 | 176,241 | 316,295 | 322,099
Operating segments | Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 63,314 | 8,431 | 94,946 | 32,635
Corporate, non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ (51,584) | $ (46,406) | $ (94,019) | $ (90,587)

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