Common Shares And Stock-Based Awards Plans (Summary Of Stock Options) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock-Based Compensation [Abstract]
Number of Options, Outstanding, Beginning balance	2,437	3,084	4,240
Number of Options, Granted	289	378	348
Number of Options, Exercised	(114)	(940)	(713)
Number of Options, Forfeited or expired	(32)	(85)	(791)
Number of Options, Outstanding, Ending balance	2,580	2,437	3,084
Number of Options, Exercisable as of December 31, 2015	1,802	1,600	2,400
Weighted-Average Exercise Price, Outstanding, Beginning balance	$ 20.07	$ 19.79	$ 19.88
Weighted-Average Exercise Price, Granted	23.14	22.94	17.37
Weighted-Average Exercise Price, Exercised	17.39	20.06	15.72
Weighted-Average Exercise Price, Forfeited or expired	23.4	22.61	22.88
Weighted-Average Exercise Price, Outstanding, Ending balance	20.49	20.07	19.79
Weighted-Average Exercise Price, Exercisable as of December 31, 2015	$ 20.19	$ 20.32	$ 20.63
Weighted-Average Remaining Contractual Term (Years), Outstanding	4 years 7 months 24 days
Weighted-Average Remaining Contractual Term (Years), Exercisable as of December 31, 2015	2 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding as of December 31, 2015	$ 4,969
Aggregate Intrinsic Value, Exercisable as of December 31, 2015	$ 4,078