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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Schedule of Weighted-Average Assumptions Used in Valuing Stock Options Granted to Employees [Table Text Block]
The following are the weighted-average assumptions used in valuing the stock options granted to employees for the years ended December 31, 2011, 2010 and 2009:
 
 
2011
 
2010
 
2009
Stock price volatility
34
%
 
31
%
 
40
%
Risk-free interest rate
1.88
%
 
2.12
%
 
2.13
%
Expected life (in years)
4.97

 
4.84

 
5.01

Dividend rate
0
%
 
0
%
 
0
%
Forfeiture rate
6.1
%
 
7.0
%
 
7.7
%
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the status of employee stock options as of December 31, 2011 and changes during the year then ended is presented below:
 
All Employee Options
Number of
Shares (in thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at January 1, 2011
7,332

 
$
13.86

 
 
 
 
Granted
602

 
$
19.86

 
 
 
 
Exercised
(655
)
 
$
12.95

 
 
 
 
Forfeited
(62
)
 
$
19.56

 
 
 
 
Expired
(690
)
 
$
21.79

 
 
 
 
Outstanding at December 31, 2011
6,527

 
$
13.61

 
3.65

 
$
15,315

Exercisable at December 31, 2011
5,453

 
$
12.37

 
2.66

 
$
15,315

Vested and expected to vest at December 31, 2011
6,436

 
$
13.53

 
3.57

 
$
15,315
Schedule of Employee Stock Options and Restricted Stock Units [Table Text Block]
A summary of restricted stock units as of December 31, 2011 and changes during the year are presented below:
 
Restricted Stock Units
Restricted Stock
Units (in thousands)
 
Weighted
Average
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at January 1, 2011
4,417

 
 
 
 
Granted
1,929

 
 
 
 
Vested
(451
)
 
 
 
 
Forfeited
(244
)
 
 
 
 
Outstanding at December 31, 2011
5,651

 
2.91

 
$
78,030

Vested and expected to vest at December 31, 2011
4,597

 
2.78

 
$
63,488
Schedule of Employee Service Share Based Compensation Allocation of Recognized Period Costs [Table Text Block]
Share-based compensation expense before taxes for the years ended December 31, 2011, 2010 and 2009 totaled approximately $19.5 million, $13.6 million and $9.7 million, respectively, as shown in the table below. No share-based compensation cost was capitalized in inventory in 2011, 2010 or 2009 as the amounts were not material. The excess tax benefit realized for the tax deductions of the share-based payment arrangements totaled $4.2 million, $2.0 million and $5.9 million, respectively, for the years ended December 31, 2011, 2010 and 2009.
 
Compensation Expense (in thousands)
2011
 
2010
 
2009
Cost of sales
$
1,672

 
$
932

 
$
799

Research and development
3,055

 
2,087

 
1,826

Sales and marketing
4,285

 
2,885

 
1,936

General and administrative
10,528

 
7,688

 
5,186

Share-based compensation expense before taxes
19,540

 
13,592

 
9,747

Income tax benefit
4,231

 
2,856

 
2,913

Net share-based compensation expense
$
15,309

 
$
10,736

 
$
6,834