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Earnings per Share/Capital Stock: (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 27, 2014
Additional disclosure      
Options outstanding (in shares) 247,064 352,096  
Stock options included in the calculation of diluted EPS (in shares) 247,064 352,096  
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 57,249 92,586  
Value of Common Shares issued under DRP and the 2000 and 2008 Employee Plans $ 201 $ 625  
Common Shares repurchased in the open market under DRP and 401(k) Plan 159,754 85,194  
Dividends paid $ 7,846 $ 6,838  
Quarterly dividends paid, per share of common stock (in dollars per share) $ 0.2025 $ 0.1775  
Authorized shares to be repurchased     1,250,000
Restricted Stock Units
      
Additional disclosure      
Restricted stock units outstanding (in shares) 237,174 290,416