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BUSINESS COMBINATIONS (2016 Acquisitions) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 514,189 $ 478,523   $ 465,154
2016 Acquisitions        
Business Acquisition [Line Items]        
Accounts receivable     $ 16,242  
Inventories and supplies     12,688  
Prepaid expenses and other current assets     752  
Property, plant and equipment     143,916  
Permits and other intangibles     28,856  
Current liabilities     (19,905)  
Closure and post-closure liabilities, less current portion     (3,004)  
Remedial liabilities, less current portion     (2,545)  
Deferred taxes, unrecognized tax benefits and other long-term liabilities     (20,219)  
Total identifiable net assets     156,781  
Goodwill     47,977  
Total purchase price, net of cash acquired     $ 204,758