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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income (Loss)
Beginning balance, shares at Dec. 29, 2012   27,781,659      
Beginning balance at Dec. 29, 2012 $ 275,817 $ 278 $ 199,903 $ 75,437 $ 199
Issuance of common stock for exercise of stock options, shares 840,951 840,951      
Issuance of common stock for exercise of stock options, value $ 13,629 $ 8 13,621    
Deferred Compensation Arrangement with Individual, Shares Issued 9,780        
Stock Issued During Period, Value, Other $ 0 $ 0 0    
Vesting of restricted stock units, shares   348,141      
Vesting of restricted stock units, value 0 $ (3) 3    
Tax benefit of excess stock based compensation deduction 1,413   1,413    
Deferred Compensation Arrangement with Individual, Compensation Expense 13,409   13,409    
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, shares   (45,278)      
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, value (1,212)   (1,212)    
Unrealized gain on short term investment (52)       (52)
Director's deferred compensation 44   44    
Net income 27,641     27,641  
Ending balance, shares at Dec. 28, 2013   28,935,253      
Ending balance at Dec. 28, 2013 $ 330,689 $ 289 227,175 103,078 147
Issuance of common stock for exercise of stock options, shares 486,252 486,252      
Issuance of common stock for exercise of stock options, value $ 8,943 $ 5 8,938    
Vesting of restricted stock units, shares   318,367      
Vesting of restricted stock units, value 0 $ (3) (3)    
Tax benefit of excess stock based compensation deduction 2,776   2,776    
Deferred Compensation Arrangement with Individual, Compensation Expense 13,778   13,778    
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, shares   (39,297)      
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, value (1,626)   (1,626)    
Unrealized gain on short term investment (298)       (298)
Director's deferred compensation $ 49   49    
Stock Repurchased and Retired During Period, Shares (55,973)        
Stock Repurchased and Retired During Period, Value     (1,678)    
Net income $ 37,803     37,803  
Ending balance, shares at Dec. 27, 2014 29,644,602 29,644,602      
Ending balance at Dec. 27, 2014 $ 390,436 $ 297 249,409 140,881 (151)
Issuance of common stock for exercise of stock options, shares 390,085 390,085      
Issuance of common stock for exercise of stock options, value $ 6,464 $ 4 6,460    
Deferred Compensation Arrangement with Individual, Shares Issued 14,610        
Stock Issued During Period, Value, Other $ 0 $ 0 0    
Vesting of restricted stock units, shares   340,754      
Vesting of restricted stock units, value 0 $ (3) (3)    
Tax benefit of excess stock based compensation deduction 822   822    
Amortization of deferred compensation relating to stock options 14,183        
Deferred Compensation Arrangement with Individual, Compensation Expense     14,183    
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, shares   (37,969)      
Stock withheld to cover tax withholdings requirements upon vesting of restricted stock units, value (1,295)   (1,295)    
Unrealized gain on short term investment (85)       (85)
Director's deferred compensation $ 149   149    
Stock Repurchased and Retired During Period, Shares (1,260,276)        
Stock Repurchased and Retired During Period, Value $ (37,393) $ (13) (37,380)    
Net income $ 44,130     44,130  
Ending balance, shares at Jan. 02, 2016 29,091,806 29,091,806      
Ending balance at Jan. 02, 2016 $ 417,411 $ 291 $ 232,345 $ 185,011 $ (236)