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Stock-Based Compensation Plans (Details 3) (Restricted stock [Member], USD $)
9 Months Ended
Sep. 30, 2012
Restricted stock [Member]
 
Summary of restricted stock awards and restricted stock units  
Unvested balance at December 31, 2011, Shares 4,289,024
Granted, Shares 923,250
Vested, Shares (920,431)
Forfeited, Shares 516,278
Unvested balance at September 30, 2012, Shares 3,775,565
Unvested balance at December 31, 2011, Weighted average grant date fair value $ 8.23
Granted, Weighted average grant date fair value $ 3.62
Vested, Weighted average grant date fair value $ 6.14
Forfeited, Weighted average grant date fair value $ 7.57
Unvested balance at September 30, 2012, Weighted average grant date fair value $ 7.70