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Earnings per Share/Capital Stock: (Details 2) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
May 19, 2015
Additional disclosure          
Options outstanding (in shares) 142,402 187,152 142,402 187,152  
Stock options not included in the calculation of diluted EPS (in shares) 0        
Anti-dilutive stock options not included in the computation of diluted EPS (in shares)     0 0  
Common Shares issued under DRP and the 2000 and 2008 Employee Plans     52,212 69,617  
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 126 $ 512  
Dividends paid $ 8,200 $ 8,000 $ 16,369 $ 16,171  
Quarterly dividends paid, per share of common stock (in dollars per share) $ 0.224 $ 0.2130 $ 0.448 $ 0.4260  
Restricted Stock Units          
Additional disclosure          
Restricted stock units outstanding (in shares) 227,364 225,074 227,364 225,074  
2014 and 2015 Stock Repurchase Programs | AWR          
Additional disclosure          
Authorized shares to be repurchased         2,450,000.00
Common Shares repurchased in the open market under DRP and 401(k) Plan       1,100,000.0