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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