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Compensation Arrangements (Tables)
 12 Months Ended
Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The table below summarizes the stock option activity for the year ended December 31, 2014:
 
 
Options
 
Weighted- Average Exercise Price
 
Weighted- Average Remaining Contractual Term (in years)
 
Aggregate Intrinsic Value
(in thousands) (1)
Outstanding at December 31, 2013
 
3,355,054

 
$
1.11

 
6.04
 
$
35,742

    Exercised
 
(1,029,471
)
 
$
1.09

 
 
 
 
    Forfeited
 
(62,589
)
 
$
2.41

 
 
 
 
Outstanding at December 31, 2014
 
2,262,994

 
$
1.09

 
5.03
 
$
16,226

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2014
 
2,262,994

 
$
1.09

 
5.03
 
$
16,226

(1)
The aggregate intrinsic value of options outstanding and exercisable represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of December 31, 2014 and 2013, respectively.