Stock-Based Compensation (Summary Of Stock Options) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Stock-Based Compensation [Abstract]
Number of Options, Outstanding, Beginning balance	2,580
Number of Options, Granted		289
Number of Options, Exercised	(47)
Number of Options, Forfeited or expired	(270)
Number of Options, Outstanding, Ending balance	2,263
Number of Options, Exercisable as of March 31, 2016	1,789
Weighted-Average Exercise Price, Outstanding, Beginning balance	$ 20.49
Weighted-Average Exercise Price, Exercised	15.97
Weighted-Average Exercise Price, Forfeited or expired	23.2
Weighted-Average Exercise Price, Outstanding, Ending balance	20.27
Weighted-Average Exercise Price, Exercisable as of March 31, 2016	$ 19.79
Weighted-Average Remaining Contractual Term (Years), Outstanding	4 years 10 months 28 days
Weighted-Average Remaining Contractual Term (Years), Exercisable as of March 31, 2016	3 years 5 months 5 days
Aggregate Intrinsic Value, Outstanding as of March 31, 2016	$ 7,738
Aggregate Intrinsic Value, Exercisable as of March 31, 2016	$ 7,256