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Utility Plant and Intangible Assets 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Intangible assets      
Total utility plant, at cost $ 1,930,224 $ 1,839,421  
Total amortized intangible assets 30,321 29,989  
Less - accumulated amortization (24,460) (24,309)  
Intangible assets, net of amortization 5,861 5,680  
Unamortized intangible assets [1] 399 402  
Amortization of intangible assets 654 $ 1,300 $ 1,100
Estimated future consolidated amortization expenses related to intangible assets      
2014 142    
2015 114    
2016 114    
2017 74    
2018 0    
Total $ 444    
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] $ 8,694 $ 8,695  
Water planning studies      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years 14 years  
Total amortized intangible assets $ 12,141 $ 11,808  
GSWC      
Intangible assets      
Total utility plant, at cost 1,784,402 1,808,867  
Total amortized intangible assets 28,508 29,418  
Less - accumulated amortization (24,305) (24,166)  
Intangible assets, net of amortization 4,203 5,252  
Unamortized intangible assets [1] $ 399 $ 402  
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 $ 10,898 $ 11,808  
Intangible Assets [Member] | American States Utility Services [Member]      
Intangible assets      
Total utility plant, at cost $ 571 $ 571  
[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, 2020 and 2019.