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Stock-based Compensation Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
Share-based Compensation [Abstract]  
Stock-based compensation expense recognized in the Consolidated Statements of Income and capitalized in the Consolidated Balance Sheets
Stock-based compensation expense recognized in the Consolidated Statements of Income are as follows (in thousands):
 
 
Three Months Ended
March 31,
 
2014
 
2013
Cost of goods sold
$
653

 
$
652

Research and development
1,199

 
1,081

Selling, general and administrative
4,309

 
3,963

Restructuring expenses
2,595

 
—

Stock-based compensation expense
$
8,756

 
$
5,696

Stock-based compensation costs capitalized in inventory are as follows (in thousands):
 
 
March 31,
 
2014
 
2013
Capitalized in inventory
$
729

 
$
452
Weighted-average fair value of stock-based compensation awards granted and vested, and the intrinsic value of options exercised
The weighted average fair value of stock-based compensation awards granted and vested, and the intrinsic value of options exercised during the period were (in thousands, except per share amounts): 
 
Three Months Ended
March 31,
 
 
2014
 
2013
 
Stock Option Awards:
 
 
 
 
Total fair value of awards vested
$
11

 
$
13

 
Total intrinsic value of options exercised
$
8,916

 
$
1,187

 
Restricted Stock Unit Awards:
 
 
 
 
Weighted average grant date fair value per share
$
30.27

 
$
17.30

 
Total fair value of awards granted
$
170

 
$
142

 
Total fair value of awards vested
$
3,608

 
$
184

 
Information with respect to stock option activity
 Information with respect to stock option activity is as follows:
 
Shares
(in  thousands)
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
(in thousands)
Outstanding at December 31, 2013
7,338

 
$
22.38

 
4.6
 
 
Granted
—

 
—

 
 
 
 
Exercised
(559
)
 
18.00

 
 
 
 
Forfeited
(14
)
 
27.33

 
 
 
 
Outstanding at March 31, 2014
6,765

 
$
22.73

 
4.2
 
$
88,047

Exercisable at March 31, 2014
5,553

 
$
22.27

 
3.3
 
$
74,577

Vested and expected to vest at March 31, 2014
6,704

 
$
22.72

 
4.2
 
$
87,374
Information with respect to restricted stock unit activity
Information with respect to restricted stock unit activity is as follows:
 
 
Shares
(in  thousands)
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2013
2,788

 
$
21.16

Granted
6

 
30.27

Vested and distributed
(105
)
 
25.25

Forfeited
(72
)
 
26.41

Outstanding at March 31, 2014
2,617

 
$
20.88