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ACQUISITION OF AQUARION AND GOODWILL - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 04, 2017
Business Acquisition [Line Items]      
Goodwill $ 4,427,266 $ 4,427,266  
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 215,500    
Current Liabilities (121,900)    
Noncurrent Liabilities (421,600)    
Long-Term Debt (778,300)    
Total Cash Purchase Price $ 877,700