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STOCKHOLDERS EQUITY (Tables)
 12 Months Ended
Dec. 31, 2013
Share based payment award  
Schedule of activity for all stock-based compensation plans
Activity for all stock based compensation plans for the year ended December 31, 2013 is as follows:
 
 
Stock Options/SARs
Outstanding
 
Restricted Stock Awards
Outstanding
 
 
Number of
Shares
 
Weighted-
Average Exercise
Price
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value
Balance as of December 31, 2012
 
1,962,008

 
$
28.99

 
471,562

 
$
28.77

Granted
 
343,558

 
$
35.78

 
201,973

 
$
35.53

Exercised/vested
 
(357,034
)
 
$
24.01

 
(110,987
)
 
$
28.93

Canceled/forfeited
 
(374,168
)
 
$
37.89

 
(64,120
)
 
$
30.82

Balance as of December 31, 2013
 
1,574,364

 
$
29.48

 
498,428

 
$
31.21

Exercisable/Deferred at December 31, 2013
 
1,154,415

 
$
28.18

 
72,473

 
$
29.92
Schedule of stock-based compensation expense
The following table summarizes the reporting of total stock based compensation expense resulting from employee stock options, including SARs, and restricted stock awards for the years ended December 31, 2013, 2012 and 2011 (in thousands):
 
 
Year Ended December 31,
 
 
2013
 
2012
 
2011
Cost of product sales
 
$
502

 
$
586

 
$
1,524

Research and development
 
1,263

 
1,490

 
850

Sales and marketing
 
2,591

 
3,057

 
1,828

General and administrative
 
3,282

 
3,483

 
2,024

Stock based compensation expense before income taxes
 
7,638

 
8,616

 
6,226

Income tax benefit
 
2,753

 
2,570

 
1,690

Total stock-based compensation expense, net of income taxes
 
$
4,885

 
$
6,046

 
$
4,536
Performance Shares
  
Share based payment award  
Schedule of assumptions to derive fair value of stock options and awards
The fair value of each LTIP award granted on January 6, 2012 was estimated at $17.07 using the Monte Carlo pricing model with the following assumptions:
 
 
2012
Grant date stock price
 
$
31.30

Expected term (in years)
 
3

Expected volatility
 
33.5
%
Risk-free interest rate
 
0.4
%
Expected dividends
 
—
Stock options
  
Share based payment award  
Schedule of assumptions to derive fair value of stock options and awards
The fair value of each stock option and SAR was estimated on the grant date using the Black Scholes option pricing model with the following weighted average assumptions for the years ended December 31, 2013, 2012 and 2011:
 
 
2013
 
2012
 
2011
Expected term (in years)
 
4.6

 
4.4

 
4.3

Expected volatility
 
32
%
 
60
%
 
58
%
Risk-free interest rate
 
0.7
%
 
0.7
%
 
1.7
%
Expected dividends
 
—

 
—

 
—