Common Shares And Stock-Based Awards Plans (Summary Of Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock-Based Compensation [Abstract]
Number of Options, Outstanding, Beginning balance	3,084	4,240	4,525
Number of Options, Granted	378	348	432
Number of Options, Exercised	(940)	(713)	(375)
Number of Options, Forfeited or expired	(85)	(791)	(342)
Number of Options, Outstanding, Ending balance	2,437	3,084	4,240
Number of Options, Exercisable at December 31, 2014	1,616	2,400	3,500
Weighted-Average Exercise Price, Outstanding, Beginning balance	$ 19.79	$ 19.88	$ 19.69
Weighted-Average Exercise Price, Granted	$ 22.94	$ 17.37	$ 15.77
Weighted-Average Exercise Price, Exercised	$ 20.06	$ 15.72	$ 12.42
Weighted-Average Exercise Price, Forfeited or expired	$ 22.61	$ 22.88	$ 20.42
Weighted-Average Exercise Price, Outstanding, Ending balance	$ 20.07	$ 19.79	$ 19.88
Weighted-Average Exercise Price, Exercisable at December 31, 2014	$ 20.32	$ 20.63	$ 20.46
Weighted-Average Remaining Contractual Term (Years), Outstanding	5 years 0 months 14 days
Weighted-Average Remaining Contractual Term (Years), Exercisable at December 31, 2014	3 years 1 month 16 days
Aggregate Intrinsic Value, Outstanding at December 31, 2014	$ 13,617
Aggregate Intrinsic Value, Exercisable at December 31, 2014	$ 8,819