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BUSINESS COMBINATIONS (2018 Acquisitions) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2018
Feb. 23, 2018
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill     $ 12,603 $ 40,704
2018 Acquisitions        
Business Acquisition [Line Items]        
Purchase price $ 26,700      
Goodwill $ 12,300      
Veolia Business        
Business Acquisition [Line Items]        
Purchase price   $ 124,500    
Revenue from acquisition included in the company's result of operations       154,000
Pre-tax loss       (900)
Depreciation expense on property, plant and equipment       14,600
Amortization expense related to intangible assets       600
Acquisition-related costs       $ 1,400
Weighted average amortization period (in years)   8 years 2 months 12 days