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Utility Plant and Intangible Assets 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Intangible assets      
Total utility plant, at cost $ 1,839,421 $ 1,780,110  
Total amortized intangible assets 29,989 30,822  
Less - accumulated amortization (24,309) (24,399)  
Intangible assets, net of amortization 5,680 6,423  
Unamortized intangible assets [1] 402 422  
Amortization of intangible assets 1,300 1,100 $ 1,500
Estimated future consolidated amortization expenses related to intangible assets      
2014 90    
2015 12    
2016 12    
2017 12    
2018 12    
Total $ 138    
Conservation [Member]      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 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    
Total amortized intangible assets [2] $ 8,695 8,695  
Water planning studies      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years    
Total amortized intangible assets $ 11,808 12,641  
GSWC      
Intangible assets      
Total utility plant, at cost 1,808,867 1,755,599  
Total amortized intangible assets 29,418 30,251  
Less - accumulated amortization (24,166) (24,268)  
Intangible assets, net of amortization 5,252 5,983  
Unamortized intangible assets [1] $ 402 $ 404  
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 $ 11,808 $ 12,641  
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, 2019 and 2018.