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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2016
Oct. 03, 2015
Oct. 01, 2016
Oct. 03, 2015
Mar. 31, 2016
Jan. 02, 2016
Class of Stock [Line Items]            
Accumulated other comprehensive income (loss) $ (6,984)   $ (6,984)     $ (5,186)
Cash dividends per common share (in dollars per share) $ 0.275 $ 0.265 $ 0.815 $ 0.78    
Common Stock            
Class of Stock [Line Items]            
Repurchased common stock, shares     608,500      
Repurchased common stock, value     $ 30,400      
Stock repurchase program, remaining authorized repurchase amount $ 162,300   162,300      
Interest rate swap            
Class of Stock [Line Items]            
Derivative, notional amount         $ 150,000  
Derivative, fixed interest rate         1.29%  
Derivative liability 1,800   1,800      
Accumulated other comprehensive income (loss) $ 1,100   $ 1,100