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Summary of Significant Accounting Policies - Real Estate Investments and Nonutility Properties (Details)
$ in Thousands
12 Months Ended
Oct. 29, 2021
USD ($)
property
Jun. 29, 2021
USD ($)
Sep. 28, 2020
USD ($)
property
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Components of Real Estate Investments [Abstract]              
Land       $ 12,615 $ 14,168    
Buildings and improvements       45,017 43,961    
Total real estate investment       57,632 58,129    
Sales agreement, holdback amount             $ 3,000
Gain on sale of properties   $ 3,000   3,000 0 $ 0  
Gain on sale of real estate investments       927 948 $ 929  
Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract]              
2022       4,251      
2023       4,230      
2024       2,990      
2025       2,912      
2026       3,075      
Thereafter       4,753      
Land and Building              
Assets Leased or Available for Lease [Abstract]              
Assets leased or available for lease       $ 58,330 $ 57,273    
SJWC              
Components of Real Estate Investments [Abstract]              
Gain on sale of properties $ 7,230            
Number of properties sold | property 2   6        
Proceeds from sale of real estate held-for-investment $ 13,150   $ 1,075        
Properties selling expenses 277            
Deferred gains on sales of properties 5,442            
Proceeds from sale of land held-for-investment 2,600            
Gain on sale of real estate investments 927   1,048        
Real estate selling expenses $ 121   $ 22        
Building and Building Improvements | Minimum              
Components of Real Estate Investments [Abstract]              
Estimated useful life       7 years      
Building and Building Improvements | Maximum              
Components of Real Estate Investments [Abstract]              
Estimated useful life       39 years