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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ 122,999 $ 126,651 $ 323,825 $ 304,416
Reconciliation to Consolidated Statements of Operations:        
Accretion of environmental liabilities 2,347 2,476 7,053 7,529
Depreciation and amortization 72,989 73,360 216,932 215,655
Goodwill impairment charge 0 34,013 0 34,013
Income from operations 47,663 16,802 99,840 47,219
Other expense 432 198 2,814 737
Loss on early extinguishment of debt 1,846 0 7,891 0
Gain on sale of business 77 (16,431) (31,645) (16,431)
Interest expense, net of interest income 20,675 21,565 65,743 62,192
Income (loss) before (benefit) provision for income taxes 24,633 11,470 55,037 721
Technical Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 72,338 72,333 203,906 201,622
Industrial and Field Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 13,255 18,234 36,652 38,627
Safety-Kleen        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 70,305 70,053 182,953 165,342
Oil, Gas and Lodging Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 912 24 969 135
Corporate Items        
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ (33,811) $ (33,993) $ (100,655) $ (101,310)