Share-Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Shared Based Compensation (Textual) [Abstract]
Share-based compensation expense	$ 12.3		$ 12.3
Weighted average expected term	2 years 7 months 24 days		2 years 7 months 24 days
Weighted average fair value of options		$ 2.62	$ 7.54	$ 2.15
Risk-free interest rate		0.99%	0.87%	2.07%
Expected dividend yield		0.00%
Expected option term (in years)		5 years 2 months 12 days	5 years 3 months 26 days	5 years 2 months 12 days
Expected volatility		74.80%	79.30%	75.00%
Stock options granted	0		1,605,325