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Shareholders' Equity (Narrative) (Details) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 05, 2020
Dec. 20, 2019
Jul. 10, 2019
Dec. 21, 2018
Jun. 29, 2018
Dec. 22, 2017
Jun. 30, 2017
Dec. 31, 2012
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Jul. 30, 2002
Equity, Class of Treasury Stock [Line Items]                        
Number of shares available for future issuance under the plans                 1,466,084      
Stock repurchase authorized                 $ 142,200,000     $ 5,000,000
Additional stock repurchase authorized                 137,200,000      
Amount available under repurchase plan                 1,700,000      
Total cost                 5,283,000 $ 1,204,000 $ 11,298,000  
Cumulative purchases                 $ 140,500,000      
Dividend declared               $ 0.10 $ 0.36 $ 0.34 $ 0.30  
Dividend payment   $ 5,800,000 $ 5,800,000 $ 5,400,000 $ 5,400,000 $ 4,700,000 $ 4,600,000   $ 11,567,000 $ 10,818,000 $ 9,288,000  
Dividends payable, date of record   Dec. 20, 2019 Jul. 10, 2019 Dec. 21, 2018 Jun. 29, 2018 Dec. 22, 2017 Jun. 30, 2017          
Dividend declared, month of payment                 2020-01      
Director [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock                 28,000      
Purchase price per share                 $ 16.25      
Total cost                 $ 500,000      
Executive Team [Member] | Restricted Stock Units (RSUs) [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Purchase of shares to cover withholding taxes                   73,000    
Value of purchased shares to cover withholding taxes                   $ 1,300,000    
Subsequent Event [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Stock repurchase authorized $ 147,200,000                      
Additional stock repurchase authorized $ 5,000,000                      
Dividend declared $ 0.38                      
Share Repurchase Plan [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock                 339,000 68,000    
Purchase price per share                 $ 15.60 $ 17.82    
Total cost                 $ 5,300,000 $ 1,200,000    
Cumulative [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock                 27,400,000 27,000,000    
Purchase price per share                 $ 5.1 $ 5.1    
Tax Withholding [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Shares withheld and not issued                 132,000 205,000    
Cost of shares withheld and not issued                 $ 2,500,000 $ 3,600,000    
Stock Option [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Percentage of eligible compensation allowed, per grant purchase                 10.00%      
Interval between employee stock purchases                 6 months      
Employee purchase price as percentage of trading value                 95.00%      
Aggregate fair market value of shares purchased by an employee                 $ 25,000      
Employee stock purchase plan, expiration date                 Jul. 01, 2023      
Total number of shares available for purchase under the plans                 105,252      
Shares issued under ESPP                 51,548 55,045 67,761  
Proceeds from ESPP                 $ 800,000 $ 800,000 $ 1,000,000  
Additional shares authorized                 250,000      
Number of shares available for future issuance under the plans                 279,606