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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity Under The Principal Option Plans
Option activity under the principal option plans as of June 30, 2013 and changes during the six months ended June 30, 2013 were as follows:
 
Number of
Shares

 
Weighted-
Average
Exercise
Price

 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)

Outstanding at December 30, 2012
2,744,057

 
$
17.24

 
5.01
 
$
1,321

Granted
132,367

 
12.32

 
 
 
 

Exercised
(112,691
)
 
12.05

 
 
 
 

Forfeited or expired
(70,563
)
 
14.05

 
 
 
 

Outstanding at June 30, 2013
2,693,170

 
$
17.30

 
4.88
 
$
3,931

Vested and expected to vest at June 30, 2013
2,532,468

 
$
17.77

 
4.62
 
$
3,258

Exercisable at June 30, 2013
2,078,434

 
$
19.44

 
3.65
 
$
1,414
Assumptions And Weighted-Average Fair Values Of Share-Based Payment Units Under Black-Scholes Option Pricing Model
The assumptions and weighted-average fair values were as follows:
Six months ended
June 30,
2013

 
June 24,
2012

Weighted-average fair value of grants
5.46

 
5.02

Valuation assumptions:
 

 
 

Expected dividend yield
0.00
%
 
0.00
%
Expected volatility
50.79
%
 
51.92
%
Expected life (in years)
5.08

 
5.05

Risk-free interest rate
0.835
%
 
0.872
%
Nonvested Service Based Restricted Stock Units
Nonvested restricted stock units as of June 30, 2013 and changes during the six months ended June 30, 2013 were as follows:
 
Number of
Shares

 
Weighted-
Average
Vest Date
(in years)

 
Weighted-
Average
Grant Date
Fair Value

Nonvested at December 30, 2012
563,106

 
0.79

 
$
21.14

Granted
568,533

 
 

 
$
11.38

Vested
(107,010
)
 
 

 
$
11.99

Forfeited
(13,982
)
 
 

 
$
14.14

Nonvested at June 30, 2013
1,010,647

 
1.18

 
$
16.71

Vested and expected to vest at June 30, 2013
866,244

 
1.13

 
 

Vested at June 30, 2013
52,500

 
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