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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2012
Share-based Compensation [Abstract]  
Stock Options, Activity [Table Text Block]
The table below summarizes the stock option activity during the year ended December 31, 2012:
    
 
 
Options
 
Weighted- Average Exercise Price
 
Weighted- Average Remaining Contractual Term (in years)
 
Aggregate Intrinsic Value
(in thousands)
(1)
Outstanding at December 31, 2011
 
17,870,713

 
$1.12
 
8.06
 
$
348,743

    Exercised
 
(9,025,164
)
 
$1.04
 
 
 
 
    Forfeited
 
(1,104,270
)
 
$1.90
 
 
 
 
    Expired
 
(27,858
)
 
$1.85
 
 
 
 
Outstanding at December 31, 2012
 
7,713,421

 
$1.09
 
7.02
 
$
29,063

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2012
 
5,090,553

 
$0.86
 
6.71
 
$
20,370

(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 exercise price exceeds the fair value) that would have been received by the option holders had all option holders exercised their options as of December 31, 2012 and 2011, respectively.
Stock Options, Weighted-Average Assumptions [Table Text Block]
The weighted‑average assumptions for stock options granted during the years ended December 31, 2011 and 2010 are outlined in the following table:
 
 
2012
 
2011
 
2010
Dividend yield
 
N/A
 
—%
 
—%
Risk-free interest rate
 
N/A
 
1.79%
 
2.58%
Expected term (in years)
 
N/A
 
4.47
 
6.13
Expected volatility
 
N/A
 
44%
 
46%
Nonvested Restricted Stock Units, Activity [Table Text Block]
The table below summarizes activity regarding unvested restricted stock units under the Plans during the year ended December 31, 2012:
 
 
Restricted Stock Units
 
Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2011
 
11,664,638

 
$
12.15

    Granted
 
26,098,364

 
$
8.99

    Vested
 
(4,452,979
)
 
$
11.28

    Forfeited
 
(3,610,675
)
 
$
13.75

Unvested at December 31, 2012
 
29,699,348

 
$
9.31

Nonvested Restricted Stock Units, Activity, Acquisition [Table Text Block]
The table below summarizes activity regarding unvested restricted stock during the year ended December 31, 2012:
 
 
Restricted Stock
 
Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2011
 
2,571,010

 
$
5.68

    Granted
 
370,793

 
$
17.20

    Vested
 
(2,041,460
)
 
$
5.00

    Forfeitures
 
(323,295
)
 
$
14.95

Unvested at December 31, 2012
 
577,048

 
$
10.31