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Stock Options, Employee Stock Purchase Plan and Restricted Stock (Tables)
 12 Months Ended
Dec. 31, 2013
Stock Options, Employee Stock Purchase Plan and Restricted Stock [Abstract]  
Weighted-Average Assumptions Used in Estimating Grant Date Fair Value Of Stock Options Granted
The assumptions used in estimating the fair value of the stock options granted during the period, along with the weighted-average grant date fair values, were as follows:

 
 
2013
  
2012
  
2011
 
 
 
  
  
 
Expected Volatility
  
49%-68
%
  
77% -85
%
  
75% - 76
%
Expected Life (in years)
  
4.0
   
4.0
   
3.8
 
Risk-free interest rate
  
0.7% - 1.4
%
  
0.7% - 0.8
%
  
1.3% - 2.0
%
Dividend yield
  
-
   
-
   
-
 
Fair value per stock option
 
$
6.95
  
$
7.76
  
$
3.71
 
Summary of Stock Option Activity
 A summary of stock option activity within the Company’s stock-based compensation plans for the years ended December 31, 2013, 2012 and 2011 is as follows:
 
 
 
 
 
 
 Number of
Shares
(in thousands)
  
 
Weighted
Average
Exercise Price
  
Weighted Average
Remaining
Contractual Term
(Years)
  
Aggregate
Intrinsic Value
 
Outstanding at December 31, 2010
  
7,960
  
$
1.87
  
  
 
 
 
Granted
  
2,030
   
6.63
  
  
 
 
 
Exercised
  
(454
)
  
1.93
  
  
 
 
 
Forfeited
  
(137
)
  
2.30
  
  
 
 
 
Outstanding at December 31, 2011
  
9,399
   
2.89
  
  
 
 
 
Granted
  
1,221
   
12.96
  
  
 
 
 
Exercised
  
(806
)
  
1.87
  
  
 
 
 
Forfeited
  
(87
)
  
4.42
  
  
 
 
 
Outstanding at December 31, 2012
  
9,727
   
4.22
  
  
 
 
 
Granted
  
321
   
15.76
  
  
 
 
 
Exercised
  
(630
)
  
4.18
  
  
 
 
 
Forfeited
  
(190
)
  
13.10
  
 
 
  
 
 
 
Outstanding at December 31, 2013
  
9,228
  
$
4.45
   
1.61
  
 
186,169,000
 
Exercisable at December 31, 2013
  
7,594
  
$
3.02
   
1.27
  
 
164,018,000
 
Non-Vested Restricted Stock Activity
The following is a summary of non-vested restricted stock activity:
 
 
 
Number of Shares
(in thousands)
  
Weighted Average
Grant Date Fair Value
 
Nonvested at December 31, 2010
  
28
  
$
1.89
 
Granted
  
-
   
-
 
Vested
  
(15
)
  
2.34
 
Canceled
  
-
   
-
 
Nonvested at December 31, 2011
  
13
  
$
1.34
 
Granted
  
35
   
14.63
 
Vested
  
(30
)
  
9.09
 
Canceled
  
-
   
-
 
Nonvested at December 31, 2012
  
18
  
$
14.63
 
Granted
  
32
   
15.36
 
Vested
  
(34
)
  
14.98
 
Canceled
  
-
   
-
 
Nonvested at December 31, 2013
  
16
  
$
15.36