Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Tables)

v2.4.0.6
Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-Based Compensation Activity
A summary of stock-based compensation activity and changes for the thirteen weeks ended March 31, 2013 are as follows:
 
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
(Year)
 
Aggregate
Intrinsic
Value
Outstanding and expected to vest at December 30, 2012
1,052,861

 
$
5.28

 
 
 
 
Granted
130,432

 
28.51

 
 
 
 
Exercised
(310,304
)
 
2.87

 
 
 
 
Forfeited
(2,175
)
 
8.22

 
 
 
 
Outstanding and expected to vest at March 31, 2013
870,814

 
$
9.61

 
5.98
 
$
20,003

Exercisable at March 31, 2013
589,118

 
$
4.69

 
4.62
 
$
16,433

Weighted Average Assumptions
The weighted-average grant date fair value of options granted during the thirteen weeks ended March 31, 2013 was $10.95 per share, as estimated at the date of grant using the Black-Scholes pricing model with the following weighted-average assumptions: 
 
2013
Dividend yield
0
%
Expected volatility
43
%
Risk-free rate of return
0.77
%
Expected life (in years)
5