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v3.20.1

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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