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Share-Based Compensation - Restricted Shares and Other (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
item
$ / shares
shares
Jan. 02, 2016
USD ($)
$ / shares
shares
Jan. 03, 2015
USD ($)
shares
Additional disclosures      
Additional compensation cost for modified awards | $ $ 0.1    
2006 Incentive Plan      
Additional disclosures      
Number of shares authorized 4,874,000    
Shares available for grant 60,221    
Options      
Additional disclosures      
Fair value of options vested | $ $ 1.5 $ 1.5 $ 1.4
Unrecognized compensation cost, net of expected forfeitures | $ $ 3.0    
Weighted-average period over which cost is expected to be recognized 2 years 4 months 24 days    
Forfeiture rate (as a percent) 0.50% 1.10% 4.00%
Restricted shares      
Restricted Stock and Stock Units, Number of Shares      
Vested (in shares) (201,905) (106,504) (149,195)
Restricted stock      
Additional disclosures      
Fair value of options vested | $ $ 0.6 $ 0.6 $ 0.6
Number of vesting installments | item 4    
Unrecognized compensation cost, net of expected forfeitures | $ $ 1.0    
Weighted-average period over which cost is expected to be recognized 2 years 7 months 6 days    
Forfeiture rate (as a percent) 1.20%    
Restricted stock | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 68,741    
Granted (in shares) 21,231    
Vested (in shares) (27,850)    
Balance at the end of the period (in shares) 62,122 68,741  
Restricted Stock and Stock Units, Weighted-Average Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 22.47    
Granted (in dollars per share) | $ / shares 24.73    
Vested (in dollars per share) | $ / shares 21.58    
Balance at the end of the period (in dollars per share) | $ / shares $ 23.64 $ 22.47  
Time-Vesting RSUs      
Additional disclosures      
Fair value of options vested | $ $ 1.9 $ 1.8 $ 1.5
Number of vesting installments | item 4    
Unrecognized compensation cost, net of expected forfeitures | $ $ 4.1    
Weighted-average period over which cost is expected to be recognized 2 years 4 months 24 days    
Forfeiture rate (as a percent) 1.20%    
Time-Vesting RSUs | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 252,321    
Granted (in shares) 16,000    
Vested (in shares) (83,570)    
Balance at the end of the period (in shares) 184,751 252,321  
Restricted Stock and Stock Units, Weighted-Average Fair Value      
Balance at the beginning of the period (in dollars per share) | $ / shares $ 23.36    
Granted (in dollars per share) | $ / shares 30.96    
Vested (in dollars per share) | $ / shares 22.99    
Balance at the end of the period (in dollars per share) | $ / shares $ 24.18 $ 23.36  
PRSU      
Additional disclosures      
Vesting period 2 years    
PRSU | Vesting in the first year following performance period      
Additional disclosures      
Vesting percentage 75.00%    
PRSU | Vesting on the fourth anniversary of date of grant      
Additional disclosures      
Vesting percentage 25.00%    
PRSU | Minimum      
Additional disclosures      
PRSUs performance measure (as a percent) 50.00%    
PRSU | Maximum      
Additional disclosures      
PRSUs performance measure (as a percent) 125.00%    
PRSU | 2006 Incentive Plan      
Restricted Stock and Stock Units, Number of Shares      
Balance at the beginning of the period (in shares) 558,159 365,468 245,200
Granted (in shares) 26,666 204,315 153,518
Vested (in shares) (90,485)   (25,336)
Forfeited (in shares) (83,187) (11,624) (7,914)
Balance at the end of the period (in shares) 411,153 558,159 365,468
Additional disclosures      
Achievement percentage (as a percent) 125.00% 125.00% 125.00%
1998 Employee Stock Purchase Plan (ESPP)      
Additional disclosures      
Number of shares authorized 243,000    
Purchase price as a percentage of fair market value (as a percent) 85.00%    
Offering period under the plan (in years) 1 year    
Offering period (in years) 0 years 0 years 0 years
Shares issued 0 0 0
Shares available for grant 211,777