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Note 13 - Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Stock Based Compensation Tables [Abstract]  
Summary of Activity for Restricted Stock Units and Performance Based Restricted Stock Units
A summary of activity for our RSUs and PRSUs for 2011 and information regarding RSUs and PRSUs outstanding and expected to vest as of December 31, 2011 is as follows:
(In thousands, except per share amounts and terms)
 
Number of
Shares
 
Weighted-Average
Grant-Date
Fair Market Value
Per Share
 
Weighted-Average
Remaining Contractual
Term (in Years)
 
Aggregate
Intrinsic
Value(1)
Outstanding, December 31, 2010
 
7,613

 
$
22.95

 
 
 
 
Grants
 
3,736

 
$
42.03

 
 
 
 
Vested
 
(2,662
)
 
$
22.06

 
 
 
 
Forfeited
 
(511
)
 
$
28.17

 
 
 
 
Outstanding, December 31, 2011
 
8,176

 
$
31.62

 
1.6

 
$
303,321

Vested and expected to vest, December 31, 2011
 
7,191

 
$
31.62

 
1.5

 
$
266,790

(1)
Aggregate intrinsic value represents the closing price per share of our stock on December 31, 2011, multiplied by the number of RSUs and PRSUs outstanding or vested and expected to vest as of December 31, 2011.
Summary of Stock Option Activity
A summary of stock option activity for 2011 and information regarding stock options outstanding, exercisable, and vested and expected to vest as of December 31, 2011 is as follows:
(In thousands, except per share amounts and terms)
 
Number of
Shares
 
Weighted-Average
Exercise Price
Per Share
 
Weighted-Average
Remaining Contractual
Term (in Years)
 
Aggregate
Intrinsic
Value(1)
Outstanding, December 31, 2010
 
10,179

 
$
20.61

 
 
 
 
Grants
 
806

 
$
42.37

 
 
 
 
Exercises
 
(4,807
)
 
$
21.29

 
 
 
 
Forfeited/Cancelled/Expired
 
(40
)
 
$
21.78

 
 
 
 
Outstanding, December 31, 2011
 
6,138

 
$
22.96

 
3.7

 
$
91,028

Exercisable, December 31, 2011
 
5,171

 
$
20.18

 
2.8

 
$
87,490

Vested and expected to vest, December 31, 2011
 
6,015

 
$
22.61

 
3.6

 
$
90,792

(1)
For those stock options with an exercise price below the closing price per share on December 31, 2011, aggregate intrinsic value represents the difference between the exercise price and the closing price per share of our common stock on December 31, 2011, multiplied by the number of stock options outstanding, exercisable, or vested and expected to vest as of December 31, 2011
Assumptions Used to Estimate Fair Value of Stock Options RSUs And PRSUs


VALUATION AND EXPENSE INFORMATION |  The assumptions used to estimate the fair value of stock options, ESPP shares, RSUs and PRSUs were as follows:  
 
 
2011
 
2010
 
2009
Stock options:
 

 

 

Expected term (in years)
 
5.0

 
3.9

 
5.0

Expected stock price volatility
 
32.7
%
 
31.9
%
 
34.1
%
Risk-free interest rate
 
0.3
%
 
1.6
%
 
2.2
%
Dividend yield
 
0.6
%
 
0.8
%
 
1.0
%
Weighted-average estimated fair value
 
$
12.92

 
$
21.96

 
$
5.90

 
 

 

 
 
ESPP shares:
 

 

 
 
Expected term (in years)
 
0.8

 
0.7

 
0.8

Expected stock price volatility
 
35.9
%
 
31.4
%
 
50.3
%
Risk-free interest rate
 
0.1
%
 
0.3
%
 
0.4
%
Dividend yield
 
0.7
%
 
0.8
%
 
1.2
%
Weighted-average estimated fair value
 
$
12.03

 
$
6.68

 
$
5.10

 
 

 

 
 
RSUs and PRSUs:
 

 

 
 
Risk-free interest rate
 
0.6
%
 
0.8
%
 
1.2
%
Dividend yield
 
0.7
%
 
0.8
%
 
1.1
%
Weighted-average estimated fair value
 
$
41.30

 
$
26.87

 
$
17.21
Stock-Based Compensation Expense
Our stock-based compensation expense included in the consolidated statements of income for the three years ended December 31, 2011 was as follows:
(In thousands)
 
2011
 
2010
 
2009
 
 

 

 

Cost of sales
 
$
1,655

 
$
1,241

 
$
1,933

Research and development expense
 
36,410

 
27,298

 
27,067

Selling, general, and administrative expense
 
44,685

 
33,579

 
35,446

Pre-tax stock-based compensation expense
 
82,750

 
62,118

 
64,446

Income tax benefit
 
(20,278
)
 
(18,298
)
 
(18,481
)
Net stock-based compensation expense
 
$
62,472

 
$
43,820

 
$
45,965