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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the three months ended March 31, 2015:
 
Number
Outstanding
 
Weighted
Average
Grant Date
Fair Value
 
Aggregate Intrinsic Value
   (in thousands) (1)
Unvested as of January 1, 2015
2,151,232

 
$
20.97

 
$
60,493

Granted
869,893

 
$
27.00

 
 
Vested
(471,050
)
 
$
19.54

 
 
Forfeited / Canceled
(15,666
)
 
$
23.61

 
 
Unvested as of March 31, 2015
2,534,409

 
$
23.29

 
$
64,780

Expected to vest after March 31, 2015
2,436,315

 
$
23.12

 
$
62,272
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes activity related to our stock options under the Equity Incentive Plan for the three months ended March 31, 2015:
 
Number
Outstanding
 
Weighted
Average Exercise Price
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
   (in thousands) (1)
Balance as of January 1, 2015
5,207,772

 
$
8.04

 
3.6
 
$
105,038

Exercised
(462,025
)
 
$
4.36

 

 


Forfeited / Canceled
(6,109
)
 
$
32.31

 

 


Balance as of March 31, 2015
4,739,638

 
$
8.36

 
3.5
 
$
82,180

Exercisable as of March 31, 2015
4,637,000

 
$
7.85

 
3.4
 
$
82,134

Exercisable as of March 31, 2015 and expected to vest thereafter
4,729,661

 
$
8.31

 
3.5
 
$
82,180
Schedule Of Pre-Tax Stock-Based Compensation Expense
The following table summarizes the components of pre-tax stock-based compensation expense (in thousands):
 
Three Months Ended
 
March 31,
 
2015
 
2014
RSUs
$
5,420

 
$
5,396

Stock options
126

 
804

Restricted stock
—

 
46

Total stock-based compensation expense
$
5,546

 
$
6,246