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Business Combination (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 09, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |
Long-term borrowings |  | $ 85,000 | $ 80,000 |  |
Borrowings on line of credit |  | 226,884 | $ 73,000 |  |
Assets Acquired |  |  |  |  |
Goodwill |  | 627,036 |  | $ 627,036 | $ 628,287
CTWS [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Consideration Transferred, Acquiree's Common Shares Converted In Cash Per Share | $ 70.00 |  |  |  |
Payments to Acquire Businesses, Gross | $ 838,476 |  |  |  |
Cash Acquired from Acquisition | 3,011 |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Equity Award Assumed in Acquisition | 6,384 |  |  |  |
Assets Acquired |  |  |  |  |
Utility plant, net | 750,703 | 750,703 |  | 750,703 |
Utility plant, net, measurement period adjustments |  |  |  | 0 |
Nonutility plant | 848 | 848 |  | 848 |
Nonutility plant, measurement period adjustments |  |  |  | 0 |
Current assets | 42,673 | 41,506 |  | 41,506 |
Current assets, measurement period adjustments |  |  |  | (1,167) |
Investments | 12,489 | 12,489 |  | 12,489 |
Investments, measurement period adjustments |  |  |  | 0 |
Regulatory assets and deferred charges, less current portion | 83,132 | 78,825 |  | 78,825 |
Regulatory assets and deferred charges, less current portion, measurement period adjustments |  |  |  | (4,307) |
Other intangible assets | 17,181 | 17,181 |  | 17,181 |
Other intangible assets, measurement period adjustments |  |  |  | 0 |
Other assets | 2,592 | 2,592 |  | 2,592 |
Other assets, measurement period adjustments |  |  |  | 0 |
Goodwill | 626,523 | 625,301 |  | 625,301 |
Goodwill, measurement period adjustments |  |  |  | (1,222) |
Total assets acquired | 1,536,141 | 1,529,445 |  | 1,529,445 |
Total assets acquired, measurement period adjustments |  |  |  | (6,696) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] |  |  |  |  |
Long-term debt | 281,009 | 281,009 |  | 281,009 |
Long-term debt, measurement period adjustments |  |  |  | 0 |
Current liabilities, including maturities of long-term debt | 125,772 | 125,797 |  | 125,797 |
Current liabilities, including maturities of long-term debt |  |  |  | 25 |
Deferred income taxes | 107,789 | 100,644 |  | 100,644 |
Deferred income taxes, measurement period adjustments |  |  |  | (7,145) |
Postretirement benefit plans | 31,789 | 31,789 |  | 31,789 |
Postretirement benefit plan, measurement period adjustments |  |  |  | 0 |
Contributions in aid of construction and construction advances | 137,327 | 137,327 |  | 137,327 |
Contributions in aid of construction and construction advancesPostretirement benefit plan, measurement period adjustments |  |  |  | 0 |
Other long-term liabilities | 10,607 | 11,031 |  | 11,031 |
Other long-term liabilities, measurement period adjustments |  |  |  | 424 |
Total liabilities assumed | 694,293 | 687,597 |  | 687,597 |
Total liabilities assumed, measurement period adjustments |  |  |  | (6,696) |
Assumed equity | $ 841,848 | $ 841,848 |  | 841,848 |
Assumed equity, measurement period adjustments |  |  |  | $ 0 |

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