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SEGMENT REPORTING - Adjusted EBITDA Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ 135,480 | $ 149,825 | $ 258,070 | $ 251,488
Reconciliation to Consolidated Statements of Operations: |  |  |  |
Accretion of environmental liabilities | 2,766 | 2,560 | 5,327 | 5,134
Depreciation and amortization | 72,494 | 74,217 | 147,027 | 149,572
Income from operations | 60,220 | 73,048 | 105,716 | 96,782
Other expense (income), net | 500 | 564 | 2,865 | (2,419)
Loss on sale of businesses | 184 | 0 | 3,258 | 0
Interest expense, net of interest income | 18,654 | 20,215 | 37,441 | 39,979
Income before provision for income taxes | 40,882 | 52,269 | 62,152 | 59,222
Operating segments | Environmental Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 138,083 | 117,868 | 246,997 | 207,378
Operating segments | Safety-Kleen |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | 46,589 | 79,459 | 107,737 | 134,252
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted EBITDA | $ (49,192) | $ (47,502) | $ (96,664) | $ (90,142)

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