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SEGMENT REPORTING (Adjusted EBITDA Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ 126,651 $ 165,607 $ 304,416 $ 407,006
Reconciliation to Consolidated Statements of Operations:        
Accretion of environmental liabilities 2,476 2,577 7,529 7,795
Depreciation and amortization 73,360 69,060 215,655 205,189
Goodwill impairment charge 34,013 0 34,013 31,992
Income (loss) from operations 16,802 93,970 47,219 162,030
Other expense 198 139 737 390
Gain on sale of business (16,431) 0 (16,431) 0
Interest expense, net of interest income 21,565 19,017 62,192 57,704
(Loss) income before (benefit) provision for income taxes 11,470 74,814 721 103,936
Technical Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 72,333 79,048 201,622 219,257
Industrial and Field Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 18,579 62,460 40,643 145,850
Kleen Performance Products        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 22,803 12,123 37,358 23,471
SK Environmental Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 47,250 40,096 127,984 108,540
Lodging Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 4,104 1,827 8,145 12,589
Reconciliation to Consolidated Statements of Operations:        
Goodwill impairment charge 34,000      
Oil and Gas Field Services        
Segment Reporting Information [Line Items]        
Adjusted EBITDA (4,425) 1,579 (10,026) 800
Corporate Items        
Segment Reporting Information [Line Items]        
Adjusted EBITDA $ (33,993) $ (31,526) $ (101,310) $ (103,501)