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Regulatory Matters - Regulatory Assets, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Regulatory Assets [Line Items]    
Regulatory assets $ 151,936 $ 154,621
Less: current regulatory assets, net 4,370 2,629
Total regulatory assets, net, less current portion 147,566 151,992
Regulatory assets, net not earning a return 85,446 84,887
Income tax temporary differences, net    
Regulatory Assets [Line Items]    
Regulatory assets 24,309 22,420
Postretirement pensions and other postretirement benefits    
Regulatory Assets [Line Items]    
Regulatory assets 63,126 62,197
Business combinations debt premium, net    
Regulatory Assets [Line Items]    
Regulatory assets 19,302 19,937
Balancing and memorandum accounts, net    
Regulatory Assets [Line Items]    
Regulatory assets 33,800 38,334
Water Rate Adjustment    
Regulatory Assets [Line Items]    
Regulatory assets 1,512 2,588
Other, net    
Regulatory Assets [Line Items]    
Regulatory assets $ 9,887 $ 9,145