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BUSINESS COMBINATIONS (2018 Acquisitions Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2018
Feb. 23, 2018
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill amount     $ 40,704 $ 8,687
Acquired Company Included in Safety-Kleen and Environmental Services Segments [Member]        
Business Acquisition [Line Items]        
Goodwill amount $ 15,800      
Veolia Division        
Business Acquisition [Line Items]        
Purchase price   $ 124,000    
Revenue from acquisition included in the company's result of operations     154,000  
Pre-tax income     900  
Depreciation expense on property, plant and equipment     14,600  
Amortization expense related to intangible assets     600  
Acquisition-related costs     $ 1,400  
Weighted average useful life (in years)   8 years 2 months