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Shareholders' Equity (Details) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 08, 2019
Dec. 21, 2018
Jun. 29, 2018
Dec. 22, 2017
Jun. 30, 2017
May 06, 2016
May 05, 2016
Dec. 31, 2012
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Jul. 30, 2002
Equity, Class of Treasury Stock [Line Items]                        
Number of shares available for future issuance under the plans                 1,798,440      
Stock repurchase authorized                 $ 142,200,000     $ 5,000,000
Additional stock repurchase authorized                 137,200,000      
Amount available under repurchase plan                 6,900,000      
Repurchase of common stock           1,500,000            
Purchase price per share           $ 14.77            
Total cost                 1,204,000 $ 11,298,000 $ 30,065,000  
Cumulative purchases                 $ 135,300,000      
Weighted average shares outstanding           4.00% 11.00%          
Weighted average shares outstanding accretive on an annualized basis           $ 0.04 $ 0.03          
Dividend declared               $ 0.10 $ 0.34 $ 0.30 $ 0.26  
Dividend payment   $ 5,400,000 $ 5,400,000 $ 4,700,000 $ 4,600,000       $ 10,818,000 $ 9,288,000 $ 7,988,000  
Subsequent Event [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Amount available under repurchase plan $ 6,000,000                      
Dividend declared $ 0.36                      
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      
Chief Executive Officer [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock           697,000            
Beneficial owners           11.80%            
Chief Executive Officer [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      
Chief Operating Officer [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock           732,000            
Beneficial owners           4.90%            
Chief Operating Officer [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      
Chief Financial Officer [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock           73,000            
Beneficial owners           0.90%            
Chief Financial Officer [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      
Share Repurchase Plan [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock                 68,000 748,000,000    
Purchase price per share                 $ 17.82 $ 15.11    
Total cost                 $ 1,200,000 $ 11,300,000    
Share Repurchase Plan [Member] | Subsequent Event [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock 32,000                      
Purchase price per share $ 15.84                      
Total cost $ 500,000                      
Share Repurchase Plan [Member] | Director [Member] | Subsequent Event [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock 28,000                      
Purchase price per share $ 16.25                      
Total cost $ 500,000                      
Share Repurchase Plan [Member] | Executive Team [Member] | Subsequent Event [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock 28,000                      
Purchase price per share $ 16.25                      
Cumulative [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Repurchase of common stock                 27,000,000 26,900,000    
Purchase price per share                 $ 5.0 $ 5.0    
Tax Withholding [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Shares withheld and not issued                 205,000 268,000    
Cost of shares withheld and not issued                 $ 3,600,000 $ 4,400,000    
Tax Withholding [Member] | Subsequent Event [Member]                        
Equity, Class of Treasury Stock [Line Items]                        
Shares withheld and not issued 143,000                      
Cost of shares withheld and not issued $ 2,700,000                      
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                 156,800      
Shares issued under ESPP                 55,045 67,761 67,111  
Proceeds from ESPP                 $ 800,000 $ 1,000,000 $ 1,000,000  
Additional shares authorized                 250,000      
Number of shares available for future issuance under the plans                 279,606