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BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]    
Goodwill $ 517,910 $ 514,189
Veolia Division    
Business Acquisition [Line Items]    
Accounts receivable 39,558  
Inventories and supplies 1,126  
Prepaid 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, net of cash acquired $ 124,500