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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
May. 19, 2015
Mar. 27, 2014
Additional disclosure            
Options outstanding (in shares) 187,152 245,784 187,152 245,784    
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     69,617 70,573    
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 512 $ 219    
Dividends paid $ 8,000 $ 7,900 $ 16,171 $ 15,699    
Quarterly dividends paid, per share of common stock (in dollars per share) $ 0.2130 $ 0.2025 $ 0.426 $ 0.405    
Restricted Stock Units            
Additional disclosure            
Restricted stock units outstanding (in shares) 225,074 239,226 225,074 239,226    
2014 Stock Repurchase Program | AWR            
Additional disclosure            
Authorized shares to be repurchased           1,250,000.00
Common Shares repurchased in the open market under DRP and 401(k) Plan     704,782      
2015 Stock Repurchase Program | AWR            
Additional disclosure            
Authorized shares to be repurchased         1,200,000.0  
Common Shares repurchased in the open market under DRP and 401(k) Plan     387,021