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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ 309,070 | $ 187,771 | $ 489,329 | $ 317,222
Reconciliation to Consolidated Statements of Operations: |  |  |  |
Accretion of environmental liabilities | 3,197 | 2,873 | 6,353 | 5,826
Stock-based compensation | 6,835 | 3,305 | 12,547 | 6,785
Depreciation and amortization | 87,868 | 71,592 | 172,166 | 143,755
Income from operations | 211,170 | 110,001 | 298,263 | 160,856
Other (income) expense, net | (1,265) | 1,480 | (1,969) | 2,708
Gain on sale of business | (8,864) | 0 | (8,864) | 0
Interest expense, net of interest income | 26,256 | 18,051 | 51,273 | 35,969
Income before provision for income taxes | 195,043 | 90,470 | 257,823 | 122,179
Operating segments | Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 269,341 | 176,041 | 452,943 | 316,295
Operating segments | Safety-Kleen Sustainability Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 97,010 | 63,314 | 148,887 | 94,946
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ (57,281) | $ (51,584) | $ (112,501) | $ (94,019)

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