Stock-Based Compensation and Other Employee Benefit Plans (Summary of Employee Stock Purchase Plan Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares	498,123
ESPPs [Member] | Employee Stock Purchase [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash proceeds (in millions)	$ 6.0	$ 0.9
Number of common shares	436,925	67,073
Weighted average price per share	$ 13.69	$ 13.43
Weighted average grant date fair value per share	$ 5.55	$ 3.96