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BUSINESS COMBINATIONS (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 03, 2016
Apr. 11, 2015
Dec. 31, 2015
Mar. 31, 2016
Nevada Rerefinery Facility        
Business Acquisition [Line Items]        
Purchase price $ 35.0      
Thermo Fluids Inc.        
Business Acquisition [Line Items]        
Purchase price   $ 79.3    
TFI's revenues included in the Company's results of operations       $ 7.8
Privately Owned Domestic Company        
Business Acquisition [Line Items]        
Payments to acquire business     $ 14.7  
Goodwill, acquired during period     $ 7.4