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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation [Abstract]  
Schedule of weighted-average assumptions used to value options as of their grant date
The weighted-average assumptions used to value options as of their grant date were as follows:
 
Year Ended
December 31,
 
2014
 
2013
 
2012
Risk-free interest rate
1.52
%
 
1.06
%
 
0.69
%
Expected volatility
46.5
%
 
50.9
%
 
64.6
%
Expected life (in years)
4.21

 
4.24

 
4.22

Dividend yield
0
%
 
0
%
 
0
%
Schedule of share-based compensation, stock options, activity
The changes in outstanding stock options for the year ended December 31, 2014 are as follows:
 
 
Number of Options
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining
Contractual Life
(in Years)
 
Aggregate Intrinsic
Value
Outstanding at December 31, 2013
1,021,791

 
$
11.55

 
 
 
 
Granted
326,496

 
11.74

 
 
 
 
Exercised
(53,232
)
 
8.85

 
 
 
 
Expired, canceled or forfeited
(90,452
)
 
12.55

 
 
 
 
Outstanding at December 31, 2014
1,204,603

 
$
11.65

 
2.72
 
$
1,814

Exercisable at December 31, 2014
489,674

 
$
11.87

 
1.76
 
$
761

Options vested or expected to vest at December 31, 2014
1,164,544

 
$
11.64

 
2.67
 
$
1,768
Schedule of share-based compensation, activity
Restricted stock activity under the Amended and Restated 2006 Stock Incentive Plan for 2014 is as follows:
 
 
Number of
Shares
 
Weighted-
average
grant date
fair value
Outstanding at December 31, 2013, unvested
379,007

 
$
13.61

Granted
265,380

 
13.57

Vested
(182,606
)
 
13.41

Forfeited
(34,679
)
 
13.81

Outstanding at December 31, 2014, unvested
427,102

 
$
13.67