Stock-Based Compensation and Other Employee Benefit Plans (Summary of Employee Stock Purchase Plan Activity) (Details) (ESPPs [Member], Employee Stock Purchase [Member], USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash proceeds (in millions)	$ 5.5	$ 0.5
Number of common shares (in thousands)	416,400	34,900
Weighted average price per share	$ 13.10	$ 14.02
Weighted Average [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value per share, grant date	$ 5.49	$ 4.08