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STOCK-BASED COMPENSATION (Tables)
9 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Grants in Period, Weighted Average Grant Date Fair Value
The weighted average grant date per share fair values of the options awarded to employees were as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
2015
 
September 30,
2014
 
September 30,
2015
 
September 30,
2014
Weighted average grant date per share fair value
$
8.23

 
$
7.73

 
$
8.73

 
$
9.88


Summary of Stock Option Activity
Stock option activity during the nine months ended September 30, 2015 is summarized as follows:  
 
Option Shares(thousands)
 
Weighted average exercise price
 
Weighted average remaining contractual life (years)
 
Aggregate intrinsic value (thousands)
Outstanding at December 31, 2014
4,854

 
$
14.50

 
 
 
 
Granted
2,514

 
24.82

 
 
 
 
Exercised
(519
)
 
8.30

 
 
 
 
Forfeited
(311
)
 
16.80

 
 
 
 
Outstanding at September 30, 2015
6,538

 
$
18.85

 
7.7
 
$
26,096

Exercisable at September 30, 2015
2,647

 
$
12.34

 
5.8
 
$
23,309

Expected to vest at September 30, 2015
3,891

 
$
23.28

 
9.1
 
$
2,787

Intrinsic Value and Stock-based Compensation Schedule
 
Three Months Ended
 
Nine Months Ended
(In thousands)
September 30,
2015
 
September 30,
2014
 
September 30,
2015
 
September 30,
2014
Intrinsic value of stock options exercised
$
2,757

 
$
853

 
$
8,696

 
$
16,750

 
 
 
 
 
 
 
 
Stock-based compensation expense
$
2,266

 
$
1,661

 
$
6,935

 
$
5,211

Net stock-based compensation capitalized into inventory
140

 

 
140

 

Total stock-based compensation cost
$
2,406

 
$
1,661

 
$
7,075

 
$
5,211