Stock-Based Compensation (Summary Of Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Stock-Based Compensation [Abstract]
Number of Options, Outstanding, Beginning balance	4,525
Number of Options, Granted	431
Number of Options, Exercised	(288)
Number of Options, Forfeited or expired	(329)
Number of Options, Outstanding, Ending balance	4,339	4,525
Number of Options, Exercisable as of September 30, 2012	3,293
Weighted-Average Exercise Price, Outstanding, Beginning balance	$ 19.69
Weighted-Average Exercise Price, Granted	$ 15.77
Weighted-Average Exercise Price, Exercised	$ 12.00
Weighted-Average Exercise Price, Forfeited or expired	$ 20.51
Weighted-Average Exercise Price, Outstanding, Ending Balance	$ 19.75	$ 19.69
Weighted-Average Exercise Price, Exercisable, Ending Balance	$ 20.86
Weighted-Average Remaining Contractual Term (Years), Outstanding	4 years 11 months 19 days	5 years 18 days
Weighted-Average Remaining Contractual Term (Years), Exercisable	3 years 11 months 19 days
Aggregate Intrinsic Value, Outstanding	$ 1,678
Aggregate Intrinsic Value, Exercisable	$ 999