Stock-Based Compensation Plans (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Feb. 17, 2012 Y
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted for the period indicated	35,969
Shares vesting period, years	4 years
Cumulative compensation expense	$ 2.3
Cumulative compensation expense recognized ratably over vesting period, years	4
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted for the period indicated	442,350
Shares vesting period, years	3 years
Cumulative compensation expense	$ 7.1
Cumulative compensation expense recognized ratably over vesting period, years	3