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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2015
Sep. 26, 2014
Oct. 02, 2015
Sep. 26, 2014
Oct. 03, 2015
Equity, Class of Treasury Stock [Line Items]          
Purchase price per share   $ 6.13   $ 6.07  
Repurchase of common stock 0 485,000   1,700,000  
Total cost   $ 3,000   $ 10,300  
Amount available under repurchase plan $ 2,300   $ 2,300    
Dividend paid, per share $ 0.10        
Dividend paid, cash value $ 3,100        
Shares repurchased for employee net vesting obligations, shares 5,000 2,000 281,000 446,000  
Shares repurchased for employee net vesting obligations, value $ 65 $ 12 $ 2,200 $ 2,700  
Stock Repurchase A [Member]          
Equity, Class of Treasury Stock [Line Items]          
Purchase price per share     $ 9.10    
Repurchase of common stock     149,000    
Total cost     $ 1,400    
Subsequent Event [Member]          
Equity, Class of Treasury Stock [Line Items]          
Dividend declared         $ 0.10