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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Dec. 31, 2016
Mar. 31, 2016
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) $ (4,633)   $ (5,000)  
Common stock repurchased, not yet settled $ 1,200      
Cash dividends per common share (in dollars per share) $ 0.56 $ 0.54    
Common Stock        
Class of Stock [Line Items]        
Repurchased common stock (in shares) 521,562 208,000    
Repurchased common stock, value $ 23,800 $ 8,700    
Stock repurchase program, remaining authorized repurchase amount 113,100      
Interest rate swap        
Class of Stock [Line Items]        
Derivative, notional amount       $ 150,000
Derivative, fixed interest rate       1.29%
Derivative liability 2,100      
Accumulated other comprehensive income (loss) $ 1,300