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SEGMENT REPORTING - Adjusted EBITDA Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Adjusted EBITDA $ 122,590 $ 101,663
Reconciliation to Consolidated Statements of Operations:    
Accretion of environmental liabilities 2,561 2,574
Depreciation and amortization 74,533 75,355
Income from operations 45,496 23,734
Other expense (income), net 2,365 (2,983)
Loss on sale of businesses 3,074 0
Interest expense, net of interest income 18,787 19,764
Income before provision for income taxes 21,270 6,953
Operating segments | Environmental Services    
Segment Reporting Information [Line Items]    
Adjusted EBITDA 108,914 89,510
Operating segments | Safety-Kleen    
Segment Reporting Information [Line Items]    
Adjusted EBITDA 61,148 54,793
Corporate Items    
Segment Reporting Information [Line Items]    
Adjusted EBITDA $ (47,472) $ (42,640)