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BUSINESS COMBINATIONS (Narrative) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 11, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
aquisition
rerefinery
Business Acquisition [Line Items]        
Goodwill, acquired during period       $ 50,067
2016 Acquisitions        
Business Acquisition [Line Items]        
Number of acquisitions | aquisition       7
Number of re-refineries acquired | rerefinery       2
Purchase price       $ 205,200
Revenue from acquisitions     $ 26,000 38,100
Acquisition-related costs     $ 700 $ 1,200
Thermo Fluids Inc.        
Business Acquisition [Line Items]        
Purchase price $ 79,300      
Privately Owned Domestic Company        
Business Acquisition [Line Items]        
Purchase price   $ 14,700    
Goodwill, acquired during period   $ 7,400