Stock-Based Compensation Plans (Details Textual) (USD $)	3 Months Ended					0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Stock Options	Mar. 31, 2014 Restricted Stock	Mar. 31, 2014 Performance Based Shares	Mar. 17, 2014 Patrick Decker	Mar. 17, 2014 Patrick Decker Restricted Stock	Mar. 17, 2014 Patrick Decker Performance Based Shares
Share-based Compensation Arrangement by Share-based Payment Award
Share-based compensation	$ 4,000,000	$ 6,000,000
Unamortized compensation expense			8,000,000	23,000,000	3,000,000
Weighted average period			2 years	2 years 1 month 6 days	2 years 6 months
Shares Awarded	373,000					165,584
Shares Awarded				286,000	43,000		40,342	40,342
Stock-Based Compensation Plans (Textual) [Abstract]
Amount of cash received from the exercise of stock options	11,000,000	1,000,000
Aggregate intrinsic value of outstanding stock options	20,000,000
Aggregate intrinsic value of exercisable stock options	30,000,000
Aggregate intrinsic value of vested and expected to vest stock options	29,000,000
Total intrinsic value of options exercised	$ 4,000,000