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Utility Plant and Intangible Assets 2 (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Intangible assets      
Total utility plant, at cost $ 1,780,110 $ 1,674,527  
Total amortized intangible assets 30,822 31,192  
Less - accumulated amortization (24,399) (23,331)  
Intangible assets, net of amortization 6,423 7,861  
Unamortized intangible assets [1] 422 422  
Amortization of intangible assets 1,100 $ 1,500 $ 1,900
Estimated future consolidated amortization expenses related to intangible assets      
2014 189    
2015 90    
2016 12    
2017 12    
2018 12    
Total $ 315    
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 $ 8,695  
Water planning studies      
Intangible assets      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 14 years 14 years  
Total amortized intangible assets $ 12,641 $ 13,011  
GSWC      
Intangible assets      
Total utility plant, at cost 1,755,599 1,658,935  
Total amortized intangible assets 30,251 30,621  
Less - accumulated amortization (24,268) (23,221)  
Intangible assets, net of amortization 5,983 7,400  
Unamortized intangible assets [1] $ 404 $ 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 $ 12,641 $ 13,011  
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, 2018 and 2017.