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BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 525,013   $ 514,189 $ 478,523
Veolia Business        
Business Acquisition [Line Items]        
Accounts receivable, including unbilled receivable   $ 39,558    
Inventories and supplies   1,126    
Prepaid expenses and other current assets   828    
Property, plant and equipment   72,243    
Permits and other intangibles   5,140    
Current liabilities   (18,372)    
Closure and post-closure liabilities   (354)    
Total identifiable net assets   100,169    
Goodwill   24,331    
Total purchase price   $ 124,500