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ACQUISITION OF AQUARION - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 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  
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