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SEGMENT REPORTING - Adjusted EBITDA Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBITDA | $ 156,613 |  | $ 141,277 | $ 408,101 | $ 369,103
Reconciliation to Consolidated Statements of Operations: |  |  |  |  |
Accretion of environmental liabilities | 2,490 |  | 2,450 | 7,624 | 7,328
Depreciation and amortization | 73,756 |  | 73,082 | 223,328 | 220,686
Income from operations | 80,367 |  | 65,745 | 177,149 | 141,089
Other expense (income), net | 427 |  | 996 | (1,992) | 449
Loss on early extinguishment of debt | 6,119 | $ 6,100 | 2,469 | 6,119 | 2,469
Interest expense, net of interest income | 19,702 |  | 19,916 | 59,681 | 60,955
Income before provision for income taxes | 54,119 |  | 42,364 | 113,341 | 77,216
Operating segments | Environmental Services |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBITDA | 121,658 |  | 102,419 | 329,036 | 273,035
Operating segments | Safety-Kleen |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBITDA | 81,326 |  | 79,502 | 215,578 | 214,455
Corporate Items |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Adjusted EBITDA | $ (46,371) |  | $ (40,644) | $ (136,513) | $ (118,387)

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