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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Narrative) (Details)
 12 Months Ended
Jun. 30, 2002
hour
Dec. 30, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Jan. 02, 2016
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
May 31, 2007
shares
Jan. 01, 2007
shares
Schedule of Shareholders' Equity [Line Items]              
Accumulated other comprehensive income (loss)   $ (3,611,000) $ (5,000,000)        
Term of employment agreement   2 years          
Accrued shares repurchased, not yet settled   $ 1,400,000          
Certain officers              
Schedule of Shareholders' Equity [Line Items]              
Change in control percentage   20.00%          
Percent of board members   0.3333          
Number of times annual salary   200.00%          
Term of employment agreement   2 years          
Corporation's Chairman, President and CEO              
Schedule of Shareholders' Equity [Line Items]              
Number of times annual salary   300.00%          
Director plan              
Schedule of Shareholders' Equity [Line Items]              
Available for future issuance (shares) | shares           300,000  
Purchase Plan              
Schedule of Shareholders' Equity [Line Items]              
Available for future issuance (shares) | shares             800,000
Rights to purchase stock, minimum working hours per week | hour 20            
Rights to purchase stock, minimum working months per year 5 months            
Price of repurchased stock as percent of closing price on the exercise date   85.00%          
Maximum amount fair value for purchase of common stock   $ 25,000          
Shares available for future issuance (shares) | shares   743,284          
Interest rate swap              
Schedule of Shareholders' Equity [Line Items]              
Derivative notional amount         $ 150,000,000    
Fixed interest rate         1.29%    
Derivative asset   $ 3,400,000          
Accumulated other comprehensive income (loss)   2,100,000          
Common Stock              
Schedule of Shareholders' Equity [Line Items]              
Stock repurchased during period   $ 58,900,000 $ 55,800,000 $ 26,700,000      
Average price per share of shares repurchased during period (in dollars per share) | $ / shares   $ 40.25 $ 51.55 $ 48.47      
Stock repurchased during period (shares) | shares   1,462,936 1,082,938 550,000      
Remaining authorized repurchase amount   $ 78,000,000