Stock-Based Compensation Plans (Schedule of Restricted Stock Unit Activity) (Details) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Award Units		0
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Award Units	13,330	0	360,665	406,027
Granted, Weighted-Average Grant-Date Fair Value per Unit	$ 13.73	$ 0.00	$ 8.64	$ 7.59
Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, Number of Award Units	0	0	321,606	346,731
Granted, Weighted-Average Grant-Date Fair Value per Unit	$ 0.00	$ 0.00	$ 9.90	$ 8.34