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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)