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Utility Plant and Intangible Assets 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Intangible assets      
Total amortized intangible assets $ 30,439 $ 30,321  
Less - accumulated amortization (26,401) (24,460)  
Intangible assets, net of amortization 4,038 5,861  
Unamortized intangible assets [1] 400 399  
Amortization of intangible assets 700 $ 654 $ 1,300
Estimated future consolidated amortization expenses related to intangible assets      
2022 672    
2023 672    
2024 672    
2025 672    
2026 672    
Total $ 3,360    
Conservation [Member]      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 3 years  
Total amortized intangible assets $ 9,486 $ 9,486  
Water and water service rights      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 30 years 30 years  
Total amortized intangible assets [2] $ 8,695 $ 8,694  
Water planning studies      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years 14 years  
Total amortized intangible assets $ 12,258 $ 12,141  
GSWC      
Intangible assets      
Total amortized intangible assets 28,629 28,508  
Less - accumulated amortization (25,109) (24,305)  
Intangible assets, net of amortization 3,520 4,203  
Unamortized intangible assets [1] $ 399 $ 399  
GSWC | Conservation [Member]      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years 3 years  
Total amortized intangible assets $ 9,486 $ 9,486  
GSWC | Water and water service rights      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 30 years 30 years  
Total amortized intangible assets [2] $ 8,124 $ 8,124  
GSWC | Water planning studies      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years 14 years  
Total amortized intangible assets $ 11,019 $ 10,898  
[1] The intangible assets not subject to amortization primarily consist of organization and consent fees.
[2]    Includes intangible assets of $571,000 for contracted services included in "Other Property and Investments" on the consolidated balance sheets as of December 31, 2021 and 2020.