Stock-Based Compensation And Other Employee Benefit Plans (Summary of Stock Options) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Stock Options Outstanding [Roll Forward]
Stock options outstanding shares, vested and expected to vest, beginning balance			2,588,170
Stock options outstanding shares, vested, beginning balance	1,445,774
Stock options exercised, shares	(391,949)		(1,132,396)
Stock options canceled/forfeited, shares	0		(10,000)
Stock options outstanding shares, vested, ending balance	1,053,825		1,445,774
Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, vested and expected to vest, beginning balance			$ 10.27
Weighted average exercise price, vested, beginning balance	$ 10.25
Weighted average exercise price, exercised	$ 9.46		$ 10.25
Weighted average exercise price, canceled/forfeited	$ 0.00		$ 13.95
Weighted average exercise price, vested, ending balance	$ 10.55		$ 10.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock options exercisable, shares	1,053,825		1,445,774
Stock options exercisable, weighted average exercise price	$ 10.55		$ 10.25
Stock options outstanding, vested and expected to vest, weighted average remaining contractual life					3 years 10 months 13 days
Stock options outstanding, vested, weighted average remaining contractual life	2 years 3 months 22 days		3 years 1 month 28 days
Stock options exercisable, weighted average remaining contractual life	2 years 3 months 22 days		3 years 1 month 28 days
Stock options outstanding, aggregate intrinsic value, vested and expected to vest					$ 11.2	[1]
Stock options outstanding, aggregate intrinsic value, vested	15.2	[1]	10.3	[1]
Stock options exercisable, aggregate intrinsic value	$ 15.2	[1]	$ 10.3	[1]

[1] Amount represents the difference between the exercise price and the market price of the Company’s stock on the last trading day of the corresponding period, multiplied by the number of in-the-money options.