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BUSINESS COMBINATIONS - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 524,581   $ 514,189
Veolia Division      
Business Acquisition [Line Items]      
Accounts receivable, including unbilled receivables   $ 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