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Summary of Significant Accounting Policies - Cash and Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 23, 2020
Public Utilities, General Disclosures [Line Items]
Total debt	$ 1,488,788	$ 1,522,955
Cash	12,344	10,908
Restricted cash	0	1,211
Maine Water Company
Public Utilities, General Disclosures [Line Items]
Total debt	$ 66,999	54,464
Cash		2,789
Restricted cash		$ 1,211
Maine Water Company | State Revolving Fund Loans Series T | Public utility, bonds
Public Utilities, General Disclosures [Line Items]
Total debt			$ 4,000

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