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Share-Based Compensation - Nonvested Restricted Shares and Other (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 02, 2016
USD ($)
item
$ / shares
shares
Jan. 03, 2015
USD ($)
$ / shares
shares
Dec. 28, 2013
USD ($)
shares
Dec. 29, 2012
shares
Additional disclosures        
Additional compensation cost for modified awards | $ $ 294      
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    
Shares issued   0 0 0
Options        
Additional disclosures        
Fair value of options vested | $ $ 1,500 $ 1,400 $ 1,300  
Unrecognized compensation cost, net of expected forfeitures | $ $ 4,100      
Weighted-average period over which cost is expected to be recognized 3 years 1 month 6 days      
Additional disclosures        
Fair value of options vested | $ $ 1,500 1,400 1,300  
Restricted shares        
Additional disclosures        
Fair value of options vested | $ $ 2,400 $ 3,200 $ 3,100  
Number of vesting installments | item 4      
Unrecognized compensation cost, net of expected forfeitures | $ $ 6,400      
Weighted-average period over which cost is expected to be recognized 3 years 1 month 6 days      
Non-vested Restricted Stock and Stock Units, Number of Shares        
Balance at the beginning of the period (in shares) 286,142      
Granted (in shares) 144,784      
Vested (in shares) (106,504) (149,195) (134,384)  
Forfeited (in shares) (3,009)      
Balance at the end of the period (in shares) 321,413 286,142    
Non-vested Restricted Stock and Stock Units, Weighted-Average Fair Value        
Balance at the beginning of the period (in dollars per share) | $ / shares $ 23.72      
Granted (in dollars per share) | $ / shares 22.01      
Vested (in dollars per share) | $ / shares 22.72      
Forfeited (in dollars per share) | $ / shares 28.26      
Balance at the end of the period (in dollars per share) | $ / shares $ 23.17 $ 23.72    
Additional disclosures        
Fair value of options vested | $ $ 2,400 $ 3,200 $ 3,100  
Number of shares issuable upon achievement of certain financial performance goals, specified period one 121,000      
Number of shares issuable upon achievement of certain financial performance goals, specified period two 150,000      
Number of shares issuable upon achievement of certain financial performance goals, specified period three 204,000