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Regulatory Assets, Net (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Regulatory Assets [Line Items]    
Regulatory assets $ 182,110 $ 158,230
Less: current regulatory assets, net 3,249 1,748
Total regulatory assets, net, less current portion 178,861 156,482
Regulatory assets, net not earning a return 121,090 119,236
Income tax temporary differences    
Regulatory Assets [Line Items]    
Regulatory assets 15,772 6,230
Postretirement pensions and other medical benefits    
Regulatory Assets [Line Items]    
Regulatory assets 99,213 95,559
Business combinations debt premium, net    
Regulatory Assets [Line Items]    
Regulatory assets 20,573 22,479
Balancing and memorandum accounts, net    
Regulatory Assets [Line Items]    
Regulatory assets 33,277 25,463
Water Rate Adjustment    
Regulatory Assets [Line Items]    
Regulatory assets 5,489 323
Other, net    
Regulatory Assets [Line Items]    
Regulatory assets $ 7,786 $ 8,176