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ACQUISITION OF AQUARION - Schedule of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Sep. 30, 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
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