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Long-Term Liabilities and Bank Borrowings (Details) - USD ($) $ in Thousands	Mar. 12, 2020	Mar. 11, 2020	Feb. 03, 2020	Mar. 31, 2020	Dec. 31, 2019	Dec. 19, 2019
Debt Instrument [Line Items]
Long-term Debt				$ 1,339,307	$ 1,305,869
Connecticut Water Company [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Principal Debt Sold	$ 35,000
Debt Instrument, Interest Rate, Stated Percentage	3.51%
Ratio of Indebtedness to Capital	0.60
Maine Water Company [Member]
Debt Instrument [Line Items]
Increase (Decrease) in Restricted Cash		$ (886)	$ (4,114)
Maine Water Company [Member] | Public Utility, Bonds [Member]
Debt Instrument [Line Items]
Ratio of Indebtedness to Capital						0.65
Maine Water Company [Member] | Public Utility, Bonds [Member] | State Revolving Fund Loans Series S [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						1.00%
Long-term Debt						$ 5,000

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