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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ 139,561 $ 120,691 $ 227,826 $ 200,826
Reconciliation to Consolidated Statements of Operations:        
Accretion of environmental liabilities 2,448 2,416 4,878 4,706
Depreciation and amortization 72,760 71,531 147,604 143,943
Income from operations 64,353 46,744 75,344 52,177
Other (income) expense, net (846) 833 (547) 2,382
Loss on early extinguishment of debt 0 6,045 0 6,045
Gain on sale of business 0 (31,722) 0 (31,722)
Interest expense, net of interest income 20,769 22,492 41,039 45,068
Income before (benefit) provision for income taxes 44,430 49,096 34,852 30,404
Environmental Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 109,199 94,832 170,616 155,022
Safety-Kleen        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 73,069 60,281 134,953 112,649
Corporate Items        
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ (42,707) $ (34,422) $ (77,743) $ (66,845)