Stock-Based Compensation (Summary Of Stock Options) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock-Based Compensation [Abstract]
Number of Options, Outstanding, Beginning balance			3,084
Number of Options, Granted	65	0	378	348
Number of Options, Exercised			(567)
Number of Options, Forfeited or expired			(37)
Number of Options, Outstanding, Ending balance	2,858		2,858
Number of Options, Exercisable at June 30, 2014	2,026		2,026
Weighted-Average Exercise Price, Outstanding, Beginning balance			$ 19.79
Weighted-Average Exercise Price, Granted			$ 22.94
Weighted-Average Exercise Price, Exercised			$ 18.98
Weighted-Average Exercise Price, Forfeited or expired			$ 19.75
Weighted-Average Exercise Price, Outstanding, Ending balance	$ 20.36		$ 20.36
Weighted-Average Exercise Price, Exercisable at June 30, 2014	$ 20.68		$ 20.68
Weighted-Average Remaining Contractual Term (Years), Outstanding			5 years
Weighted-Average Remaining Contractual Term (Years), Exercisable at June 30, 2014			3 years 2 months 15 days
Aggregate Intrinsic Value, Outstanding at June 30, 2014	$ 15,200		$ 15,200
Aggregate Intrinsic Value, Exercisable at June 30, 2014	$ 10,308		$ 10,308