Stock-Based Compensation (Summary Of Stock Options) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock-Based Compensation [Abstract]
Number of Options, Outstanding, Beginning balance			2,437
Number of Options, Granted	0	0	289	378
Number of Options, Exercised			(94)
Number of Options, Forfeited or expired			(21)
Number of Options, Outstanding, Ending balance	2,611		2,611
Number of Options, Exercisable as of September 30, 2015	1,832		1,832
Weighted-Average Exercise Price, Outstanding, Beginning balance			$ 20.07
Weighted-Average Exercise Price, Granted			23.14
Weighted-Average Exercise Price, Exercised			17.89
Weighted-Average Exercise Price, Forfeited or expired			22.91
Weighted-Average Exercise Price, Outstanding, Ending balance	$ 20.47		20.47
Weighted-Average Exercise Price, Exercisable as of September 30, 2015	$ 20.16		$ 20.16
Weighted-Average Remaining Contractual Term (Years), Outstanding			4 years 10 months 16 days
Weighted-Average Remaining Contractual Term (Years), Exercisable as of September 30, 2015			3 years 18 days
Aggregate Intrinsic Value, Outstanding as of September 30, 2015	$ 6,498		$ 6,498
Aggregate Intrinsic Value, Exercisable as of September 30, 2015	$ 5,353		$ 5,353