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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
Option activity under the Company’s incentive stock plans is as follows:

 
 
Number
 of Shares
 
Weighted Avg.
Exercise Price
 Per Share
Outstanding, December 31, 2011 (3,366,610 shares exercisable at a weighted average price of $10.31 per share and a weighted average remaining contractual life of 4.3 years)
 
7,960,170

 
$
10.26

Granted
 
1,494,250

 
10.13

Exercised
 
(415,156
)
 
7.91

Canceled
 
(882,995
)
 
11.22

Outstanding, December 31, 2012 (4,068,071 shares exercisable at a weighted average price of $9.98 per share and a weighted average remaining contractual life of 4.2 years)
 
8,156,269

 
10.25

Granted
 
700,300

 
9.96

Exercised
 
(522,218
)
 
7.62

Canceled
 
(821,263
)
 
10.92

Outstanding, December 31, 2013 (4,286,232 shares exercisable at a weighted average price of $10.12 per share and a weighted average remaining contractual life of 4.3 years)
 
7,513,088

 
10.34

Granted
 
445,767

 
10.85

Exercised
 
(1,485,784
)
 
8.56

Canceled
 
(586,132
)
 
12.38

Outstanding, December 31, 2014 (3,512,257 shares exercisable at a weighted average price of $10.53 per share and a weighted average remaining contractual life of 4.8 years)
 
5,886,939

 
$
10.64
Schedule of Share-based Compensation, Options by Exercise Price Range
Additional information regarding options outstanding at December 31, 2014 was as follows:
 
 
Stock Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Number Outstanding
 
Weighted Avg. Remaining Contractual Life (yrs)
 
Weighted Avg. Exercise Price Per Share
 
Number Exercisable
 
Weighted Avg. Exercise Price Per Share
$ 4.72 to $ 7.00
 
132,020

 
3.5
 
$
6.63

 
132,020

 
$
6.63

$ 7.01 to $ 7.46
 
298,340

 
4.1
 
7.25

 
293,380

 
7.25

$ 7.49 to $ 8.00
 
288,283

 
4.4
 
7.82

 
283,803

 
7.82

$ 8.01 to $ 9.00
 
151,588

 
3.6
 
8.54

 
141,785

 
8.53

$ 9.01 to $10.00
 
1,282,671

 
6.5
 
9.61

 
643,954

 
9.65

$10.01 to $11.00
 
1,982,999

 
6.8
 
10.41

 
868,161

 
10.40

$11.01 to $13.00
 
697,258

 
6.0
 
12.09

 
407,874

 
12.16

$13.01 to $16.00
 
973,780

 
5.5
 
13.70

 
661,280

 
13.67

$16.01 to $49.50
 
80,000

 
1.2
 
16.21

 
80,000

 
16.21

 
 
5,886,939

 
5.9
 
$
10.64

 
3,512,257

 
$
10.53
Stock options granted under the Company's option plans, valuation assumptions
The fair value of the stock options granted under the Company’s option plans was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:
 
Years Ended December 31,
 
2014
 
2013
 
2012
Expected term (years)
6.0

 
5.9

 
5.8

Stock volatility
30.7
%
 
34.5
%
 
36.6
%
Risk free interest rates
2.0
%
 
1.6
%
 
1.0
%
Dividends during expected terms
1.6
%
 
1.9
%
 
1.6
%
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
Information with respect to outstanding RSU activity is as follows:
 
 
 
Number
 of Shares
 
Weighted
Average
Grant-Date
Fair Value
Outstanding, December 31, 2011
 
667,277

 
$
9.73

Granted
 
417,531

 
9.67

Vested
 
(146,327
)
 
9.49

Forfeited
 
(61,431
)
 
9.65

Outstanding, December 31, 2012
 
877,050

 
9.83

Granted
 
591,974

 
9.31

Vested
 
(209,819
)
 
9.60

Forfeited
 
(63,943
)
 
9.69

Outstanding, December 31, 2013
 
1,195,262

 
9.63

Granted
 
780,225

 
10.78

Vested
 
(349,451
)
 
9.61

Forfeited
 
(116,935
)
 
9.89

Outstanding, December 31, 2014
 
1,509,101

 
$
10.21
Share-based compensation expense, period costs
The following table shows total share-based compensation expense recognized in the Consolidated Statements of Operations for the years ended December 31, 2014, 2013 and 2012 (in thousands):
 
Years Ended December 31,
 
2014
 
2013
 
2012
Cost of revenues
$
997

 
$
1,060

 
$
1,178

Research and development
3,197

 
2,875

 
3,132

Selling, general and administrative
3,430

 
3,162

 
3,282

Pre-tax share-based compensation expense
7,624

 
7,097

 
7,592

Less income tax effect
(2,613
)
 
(2,314
)
 
(2,583
)
Net share-based compensation expense
$
5,011

 
$
4,783

 
$
5,009