Share-Based Compensation Plans Textuals (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense from share-based compensation awards	$ 4.6
Weighted-average period of recognition of unrecognized compensation expense (in years)	3 years 2 months 12 days
Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense from share-based compensation awards	$ 3.9
Weighted-average period of recognition of unrecognized compensation expense (in years)	2 years 9 months 18 days