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Regulatory Assets, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Regulatory Assets [Line Items]    
Regulatory assets $ 161,618 $ 158,230
Less: current regulatory asset, net 226 1,748
Total regulatory assets, net, less current portion 161,392 156,482
Regulatory assets, net not earning a return 119,745 119,236
Income tax temporary differences    
Regulatory Assets [Line Items]    
Regulatory assets 7,345 6,230
Postretirement pensions and other medical benefits    
Regulatory Assets [Line Items]    
Regulatory assets 96,682 95,559
Business combinations debt premium, net    
Regulatory Assets [Line Items]    
Regulatory assets 21,843 22,479
Balancing and memorandum accounts, net    
Regulatory Assets [Line Items]    
Regulatory assets 28,137 25,463
Water Rate Adjustment (“WRA”)    
Regulatory Assets [Line Items]    
Regulatory assets 174 323
Other, net    
Regulatory Assets [Line Items]    
Regulatory assets $ 7,437 $ 8,176