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Stock-based Compensation (Tables)
 6 Months Ended
Jun. 30, 2016
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 June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Cost of goods sold
$
855

 
$
766

 
$
1,470

 
$
1,484

Research and development
1,233

 
1,185

 
2,414

 
2,325

Selling, general and administrative
6,205

 
6,229

 
10,497

 
9,129

Stock-based compensation expense
$
8,293

 
$
8,180

 
$
14,381

 
$
12,938

Stock-based compensation costs capitalized in inventory are as follows (in thousands):
 
 
June 30,
 
2016
 
2015
Capitalized in inventory
685

 
703