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Net Income Per Share (Options and Warrants Excluded From the Calculation) (Details) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Options excluded from diluted earnings per share	3.1	2.6	3.1	2.6
Warrants excluded from diluted earnings per share	6.3	6.3	6.3	6.3
Exercise price of excluded warrants	$ 7.50	$ 7.50	$ 7.50	$ 7.50
Maximum [Member]
Exercise price of excluded options	$ 14.28	$ 16.90	$ 14.28	$ 16.90
Minimum [Member]
Exercise price of excluded options	$ 3.72	$ 5.18	$ 3.72	$ 5.18