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Share-Based Compensation (Details 6) (USD $)
1 Months Ended 12 Months Ended
Jan. 01, 2011
Dec. 29, 2012
Dec. 31, 2011
Nov. 27, 2010
1998 Employee Stock Purchase Plan
       
Additional disclosures        
Number of shares authorized   243,000    
Purchase price as a percentage of fair market value   85.00%    
Offering period   1 year    
Options
       
Additional disclosures        
Fair value of options vested $ 2,250 $ 1,500,000 $ 1,100,000 $ 900,000
Unrecognized compensation cost, net of expected forfeitures   2,500,000    
Weighted-average period over which cost is expected to be recognized   2 years 3 months 18 days    
Additional disclosures        
Vested shares outstanding that include the right of first refusal provision   159,423    
Options exercisable that include the right of first refusal provision (in shares)   181,740    
Restricted stock and stock units
       
Additional disclosures        
Number of vesting installments   4    
Unrecognized compensation cost, net of expected forfeitures   $ 4,500,000    
Weighted-average period over which cost is expected to be recognized   2 years 3 months 18 days    
Non-vested Restricted Stock and Stock Units, Number of Shares        
Balance at the beginning of the period (in shares)   383,085    
Granted (in shares)   154,887    
Vested (in shares)   (216,528) (164,086) (137,622)
Forfeited (in shares)   (22,311)    
Balance at the end of the period (in shares)   299,133 383,085  
Non-vested Restricted Stock and Stock Units, Weighted-Average Fair Value        
Balance at the beginning of the period (in dollars per share)   $ 24.23    
Granted (in dollars per share)   $ 20.89    
Vested (in dollars per share)   $ 25.81    
Forfeited (in dollars per share)   $ 21.82    
Balance at the end of the period (in dollars per share)   $ 22.49 $ 24.23  
Additional disclosures        
Number of shares issuable upon achievement of certain financial performance goals, specified period one   160,000    
Number of shares issuable upon achievement of certain financial performance goals, specified period two   132,000