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Dividend Limitations (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dividend limitations        
Common shareholder’s equity $ 465,945,000 $ 506,801,000 $ 492,404,000 $ 454,579,000
Retained Earnings (Accumulated Deficit) 220,923,000 253,602,000    
GSWC        
Dividend limitations        
Fixed amount in computing maximum ability to pay dividends $ 21,000,000.0      
Percentage of consolidated net income plus the aggregate net cash proceeds received from capital stock offerings or other instruments convertible into capital stock 100.00%      
Amount available to pay dividends under the most restrictive of the Note Agreements $ 353,300,000      
Dividends paid 62,000,000 52,000,000 29,400,000  
Common shareholder’s equity $ 423,730,000 435,190,000 437,613,000 $ 416,257,000
Ratio of Indebtedness to Net Capital 0.4511      
Retained Earnings (Accumulated Deficit) $ 184,935,000 199,583,000    
GSWC | Maximum        
Dividend limitations        
Ratio of Indebtedness to Net Capital 0.6667      
Amount available to pay dividends $ 184,900,000      
AWR        
Dividend limitations        
Dividends paid     $ 29,400,000  
Common shareholder’s equity $ 465,945,000 $ 506,801,000