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Earnings per Share/Capital Stock: (Details 2) (USD $)
 0 Months Ended 3 Months Ended 6 Months Ended
May 20, 2013
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Additional disclosure            
Options outstanding (in shares)   140,834 519,273 140,834 519,273  
Stock options included in the calculation of diluted EPS (in shares)       140,834 410,760  
Stock options not included in the calculation of diluted EPS (in shares)   0 108,013 0 108,013  
Anti-dilutive stock options not included in the computation of diluted EPS (in shares)       0 500  
Common Shares issued under DRP and the 2000 and 2008 Employee Plans       104,493 131,581  
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans       $ 1,832,000 $ 2,748,000  
Common Shares repurchased in the open market under DRP and 401(k) Plan       240,612 408,962  
Dividends paid   $ 6,800,000 $ 5,300,000 $ 13,684,000 $ 10,559,000  
Quarterly dividends paid, per share of common stock (in dollars per share)   $ 0.355 $ 0.28 $ 0.71 $ 0.56  
Dividends declared per share (in dollars per share) $ 0.405          
Stock split, conversion ratio 2          
Common stock, shares outstanding   19,300,000   19,300,000   19,200,000
Restricted Stock Units
            
Additional disclosure            
Restricted stock units outstanding (in shares)   130,453 147,109 130,453 147,109  
Pro Forma
            
Additional disclosure            
Common stock, shares outstanding   38,700,000   38,700,000   38,500,000