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Earnings per Share/Capital Stock: (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Restricted Stock Units
Sep. 30, 2013
Restricted Stock Units
Mar. 27, 2014
AWR
Sep. 30, 2014
AWR
Oct. 28, 2014
Subsequent Event
Maximum
AWR
Additional disclosure                  
Options outstanding (in shares) 235,584 273,740 235,584 273,740          
Restricted stock units outstanding (in shares)         224,543 236,891      
Stock options not included in the calculation of diluted EPS (in shares) 0   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     95,331 236,528          
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans     $ 370 $ 1,948          
Common Shares repurchased in the open market under DRP and 401(k) Plan     566,258 553,067       231,298  
Dividends paid $ 8,200 $ 7,800 $ 23,931 $ 21,520          
Quarterly dividends paid, per share of common stock (in dollars per share) $ 0.2130 $ 0.2025 $ 0.618 $ 0.5575          
Authorized shares to be repurchased             1,250,000    
Dividends, Preferred Stock, Cash                 $ 0.2130