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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 25, 2011
Stock-Based Compensation 
Stock Option Activity Under The Principal Option Plans
 
Number of
Shares
Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term
(in years)
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 26, 2010
2,745,796
$ 19.11
5.32
$ 8,731
Granted
93,144
21.91
   
Exercised
(127,271)
12.40
   
Forfeited or expired
(64,633)
18.32
   
Outstanding at September 25, 2011
2,647,036
$ 19.55
4.70
$    899
Vested and expected to vest at September 25, 2011
2,614,642
$ 19.55
4.65
$    893
Exercisable at September 25, 2011
2,164,386
$ 19.63
4.07
$    634
Assumptions And Weighted-Average Fair Values Used In The Black-Scholes Model
Nine months ended
September 25,
2011
 
September 26,
2010
 
Weighted-average fair value of grants
$   9.88
 
$   7.40
 
Valuation assumptions:
       
Expected dividend yield
0.00
%
0.00
%
Expected volatility
49.85
%
48.22
%
Expected life (in years)
4.96
 
4.93
 
Risk-free interest rate
2.178
%
1.886
%
Nonvested Service Based Restricted Stock Units
 
Number of
Shares
Weighted-
Average
Vest Date
(in years)
Weighted-
Average
Grant Date
Fair Value
Nonvested at December 26, 2010
630,244
0.81
$ 20.48
Granted
247,392
 
$ 20.88
Vested
(154,342)
 
$ 21.41
Forfeited
(41,632)
 
$ 18.87
Nonvested at September 25, 2011
681,662
0.93
$ 20.51
Vested and expected to vest at September 25, 2011
629,482
0.90
 
Vested at September 25, 2011
62,590