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BUSINESS COMBINATIONS (2018 Acquisition) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 514,189 $ 478,523 $ 465,154
Veolia Division      
Business Acquisition [Line Items]      
Accounts receivable 38,201    
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 (18,025)    
Closure and post-closure liabilities, less current portion (354)    
Total identifiable net assets 99,159    
Goodwill 24,873    
Total purchase price, net of cash acquired $ 124,032