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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 12 Months Ended
Dec. 22, 2016
Jun. 30, 2016
May 06, 2016
Dec. 28, 2015
Jun. 29, 2015
Dec. 10, 2014
Dec. 10, 2013
Dec. 20, 2012
May 05, 2016
Dec. 31, 2013
Dec. 31, 2012
Mar. 09, 2017
Dec. 30, 2016
Jan. 01, 2016
Jan. 02, 2015
Jul. 30, 2002
Stockholders Equity [Line Items]                                
Stock repurchase authorized                         $ 127,200     $ 5,000
Additional stock repurchase authorized                         122,200      
Stock repurchase authorized, shares     697,000                          
Stock repurchase authorized, per share     $ 14.77                          
Amount available under repurchase plan                         $ 4,400      
Number of shares available for future issuance under the plans                         1,654,976      
Weighted average shares outstanding     4.00%           11.00%              
Weighted average shares outstanding accretive on an annualized basis     $ 0.04           $ 0.03              
Repurchase of common stock     697,000                   2,100,000 100,000    
Purchase price per share     $ 14.77                   $ 14.60 $ 9.10    
Treasury shares                         26,197,981 24,138,694    
Total cost                         $ 30,065 $ 1,356 $ 10,929  
Cumulative purchases                         $ 122,800      
Dividend declared                     $ 0.10 $ 0.30 $ 0.26 $ 0.20 $ 0.12  
Annual cash dividend per share                   $ 0.10 $ 0.10       $ 0.12  
Dividend payment $ 4,000 $ 4,000   $ 3,200 $ 3,100 $ 3,500 $ 3,100 $ 3,100         $ 7,988 $ 6,266 $ 3,508  
Employee Stock Option [Member]                                
Stockholders Equity [Line Items]                                
Shares authorized                         25,000,000      
Number of shares available for future issuance under the plans                         29,606      
Percentage of eligble compensation allowed, per grant purchase                         10.00%      
Interval between employee stock purchases                         6 months      
Employee purchase price as percentage of trading value                         95.00%      
Employee stock purchase plan, expiration date                         Jul. 01, 2018      
Shares issued under ESPP                         67,111 48,356 94,333  
Proceeds from ESPP                         $ 1,000 $ 700 $ 900  
Chief Executive Officer [Member]                                
Stockholders Equity [Line Items]                                
Stock repurchase authorized, shares     732,000                          
Beneficial owners     11.80%                          
Repurchase of common stock     732,000                          
Chief Operating Officer [Member]                                
Stockholders Equity [Line Items]                                
Stock repurchase authorized, shares     73,000                          
Beneficial owners     4.90%                          
Repurchase of common stock     73,000                          
Chief Financial Officer [Member]                                
Stockholders Equity [Line Items]                                
Stock repurchase authorized, shares     1,500,000                          
Beneficial owners     0.90%                          
Repurchase of common stock     1,500,000                          
Tax Withholding [Member]                                
Stockholders Equity [Line Items]                                
shares withheld and not issued                         294,000 297,000    
Cost of shares withheld and not issued                         $ 4,000 $ 2,500    
Cumulative [Member]                                
Stockholders Equity [Line Items]                                
Repurchase of common stock                         26,200,000 24,100,000    
Purchase price per share                         $ 4.69 $ 3.84    
Subsequent Event [Member]                                
Stockholders Equity [Line Items]                                
Number of shares available for future issuance under the plans                       3,200,000        
Repurchase of common stock                       59,000        
Purchase price per share                       $ 20.13        
Total cost                       $ 1,200        
Dividend declared                       $ 0.30        
Subsequent Event [Member] | Employee Stock Option [Member]                                
Stockholders Equity [Line Items]                                
Additional shares authorized                       250,000        
Number of shares available for future issuance under the plans                       279,606        
Subsequent Event [Member] | Tax Withholding [Member]                                
Stockholders Equity [Line Items]                                
shares withheld and not issued                       173,000        
Cost of shares withheld and not issued                       $ 2,900