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ACQUISITION OF AQUARION AND GOODWILL - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 04, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 4,427,266   $ 3,519,401
Aquarion Water Company      
Business Acquisition [Line Items]      
Current Assets 41,200    
PP&E 1,034,900    
Goodwill 907,900 $ 900,000  
Other Noncurrent Assets, excluding Goodwill 207,600    
Current Liabilities (121,100)    
Noncurrent Liabilities (421,600)    
Long-Term Debt (771,200)    
Total Cash Purchase Price $ 877,700