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BUSINESS COMBINATIONS (Narrative) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
rerefinery
acquisition
Business Acquisition [Line Items]      
Goodwill recognized   $ 4,916  
2017 Acquisitions      
Business Acquisition [Line Items]      
Purchase price $ 11,900    
Goodwill recognized $ 4,900    
2016 Acquisitions      
Business Acquisition [Line Items]      
Purchase price     $ 204,800
Number of acquisitions | acquisition     7
Number of re-refineries acquired | rerefinery     3