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Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | 15 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021 | Oct. 09, 2019
Assets acquired: |  |  |
Goodwill | $ 628,144 | $ 640,471 |
CTWS |  |  |
Assets acquired: |  |  |
Utility plant, net | 750,703 |  | $ 750,703
Utility plant, net, measurement period adjustments | 0 |  |
Nonutility plant | 848 |  | 848
Nonutility plant, measurement period adjustments | 0 |  |
Current assets | 41,888 |  | 42,673
Current assets, measurement period adjustments | (785) |  |
Investments | 12,489 |  | 12,489
Investments, measurement period adjustments | 0 |  |
Regulatory assets and deferred charges, less current portion | 78,786 |  | 83,132
Regulatory assets and deferred charges, less current portion, measurement period adjustments | (4,346) |  |
Other intangible assets | 17,181 |  | 17,181
Other intangible assets, measurement period adjustments | 0 |  |
Other assets | 2,592 |  | 2,592
Other assets, measurement period adjustments | 0 |  |
Goodwill | 626,409 |  | 626,523
Goodwill, measurement period adjustments | (114) |  |
Total assets acquired | 1,530,896 |  | 1,536,141
Total assets acquired, measurement period adjustments | (5,245) |  |
Liabilities assumed: |  |  |
Long-term debt | 281,009 |  | 281,009
Long-term debt, measurement period adjustments | 0 |  |
Current liabilities, including maturities of long-term debt | 125,797 |  | 125,772
Current liabilities, including maturities of long-term debt, measurement period adjustments | 25 |  |
Deferred income taxes | 102,378 |  | 107,789
Deferred income taxes, measurement period adjustments | (5,411) |  |
Postretirement benefit plans | 31,789 |  | 31,789
Postretirement benefit plans, measurement period adjustments | 0 |  |
Contributions in aid of construction and construction advances | 137,327 |  | 137,327
Contributions in aid of construction and construction advances, measurement period adjustments | 0 |  |
Other long-term liabilities | 10,748 |  | 10,607
Other long-term liabilities, measurement period adjustments | 141 |  |
Total liabilities assumed | 689,048 |  | 694,293
Total liabilities assumed, measurement period adjustments | (5,245) |  |
Assumed equity | 841,848 |  | $ 841,848
Assumed equity, measurement period adjustments | $ 0 |  |

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