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Stockholders' Equity and Stock-Based Compensation (Details) (USD $)
12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2011
year
Jan. 01, 2011
year
Jan. 02, 2010
year
May 18, 2011
Director Restricted Stock Plan [Member]
Dec. 31, 2011
Director Restricted Stock Plan [Member]
Aug. 29, 2011
Stock Awards [Member]
Mar. 09, 2010
Stock Awards [Member]
Mar. 10, 2009
Stock Awards [Member]
Dec. 31, 2011
Stock Awards [Member]
Summary of stock option activity [Roll Forward]                  
Options outstanding at the beginning of year 867,022                
Options outstanding at the beginning of year, Weighted-average exercise price per share $ 4.20                
Granted (in shares) 73,834                
Granted, Weighted-average exercise price per share $ 14.50                
Exercised (in shares) (121,722)                
Exercised, Weighted-average exercise price per share $ 4.34                
Forfeited (in shares) (6,000)                
Forfeited, Weighted-average exercise price per share $ 6.45                
Expired (in shares) 0                
Expired, Weighted average exercise price per share $ 0.00                
Options outstanding at the end of year 813,134 867,022              
Options outstanding at the end of year, Weighted-average exercise price per share $ 5.10 $ 4.20              
Options outstanding, Weighted-average remaining contractual life (in years) 4.0                
Options exercisable (in shares) 721,022                
Options exercisable, Weighted-average exercise price per share $ 4.26                
Options exercisable, Weighted-average remaining contractual life (in years) 3.4                
Fair value assumptions [Abstract]                  
Expected dividend yield 0.00% 0.00% 0.00%            
Risk-free interest rate 2.53% 2.73% 2.31%            
Expected term 5.75 5.77 5.80            
Expected volatility 61.10% 60.20% 58.40%            
Fair value of options granted $ 8.26 $ 4.80 $ 1.76            
Summary of non-vested and restricted stock awards [Roll Forward]                  
Stock awards outstanding at the beginning of year (in shares)         94,148       1,006,108
Stock awards outstanding at the beginning of year, Weighted Average Grant Date Fair Value (in dollars per share)         $ 5.52       $ 7.75
Shares granted       4,652 29,480 10,878 241,183 410,076 232,381
Shares granted, Weighted Average Grant Date Fair Value (in dollars per share)         $ 14.93       $ 14.57
Restricted shares where the restriction lapsed         (36,374)        
Restrictions Lapsed, Weighted Average Grant Date Fair Value (in dollars per share)         $ 7.70        
Shares vested           (2,720) (60,296) (102,518) (284,219)
Shares vested, Weighted Average Grant Date Fair Value (in dollars per share)                 $ 8.53
Shares forfeited         0       0
Shares forfeited, Weighted Average Grant Date Fair Value (in dollars per share)         $ 0       $ 0
Stock awards outstanding at the end of year (in shares)         87,254       954,270
Stock awards outstanding at the end of year, Weighted Average Grant Date Fair Value (in dollars per share)         $ 7.79       $ 9.18