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BUSINESS COMBINATIONS (Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]    
Goodwill $ 472,819 $ 465,154
2016 Acquisitions    
Business Acquisition [Line Items]    
Accounts receivable 16,242  
Measurement period adjustments, accounts receivable 475  
Inventories and supplies 12,688  
Measurement period adjustment, inventories and supplies 173  
Prepaid and other current assets 752  
Measurement period adjustment, prepaid and other current assets (25)  
Property, plant and equipment 143,916  
Measurement period adjustments, property, plant and equipment 891  
Permits and other intangibles 28,856  
Measurement period adjustments, permits and other intangibles 0  
Current liabilities (19,905)  
Measurement period adjustments, current liabilities 353  
Closure and post-closure liabilities (3,004)  
Measurement period adjustments, closure and post-closure liabilities (596)  
Remedial liabilities, less current portion (2,545)  
Measurement period adjustments, remedial liabilities, less current portion (504)  
Deferred taxes, unrecognized tax benefits and other long-term liabilities (20,219)  
Measurement period adjustments, deferred taxes, unrecognized tax benefits and other long-term liabilities (3,200)  
Total identifiable net assets 156,781  
Measurement period adjustments, total identifiable net assets (2,433)  
Goodwill 47,977  
Measurement period adjustments, goodwill 2,186  
Total purchase price, net of cash acquired 204,758  
Measurement period adjustments, total purchase price, net of cash acquired $ (247)  
At Acquisition Dates As Reported December 31, 2016 | 2016 Acquisitions    
Business Acquisition [Line Items]    
Accounts receivable   15,767
Inventories and supplies   12,515
Prepaid and other current assets   777
Property, plant and equipment   143,025
Permits and other intangibles   28,856
Current liabilities   (20,258)
Closure and post-closure liabilities   (2,408)
Remedial liabilities, less current portion   (2,041)
Deferred taxes, unrecognized tax benefits and other long-term liabilities   (17,019)
Total identifiable net assets   159,214
Goodwill   45,791
Total purchase price, net of cash acquired   $ 205,005