Stock-Based Compensation (Schedule Of Option Activity And Changes) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation [Abstract]
Options, Outstanding, beginning balance	712,320
Options, Granted	76,084
Options, Exercised	(112,962)
Options, Cancelled	(16,827)
Options, Outstanding, ending balance	658,615
Options, Exercisable, ending balance	392,200
Weighted Average Exercise Price, Outstanding, beginning balance	$ 31.40
Weighted Average Exercise Price, Granted	$ 90.83
Weighted Average Exercise Price, Exercised	$ 29.94
Weighted Average Exercise Price, Cancelled	$ 52.56
Weighted Average Exercise Price, Outstanding, ending balance	$ 37.98
Weighted Average Exercise Price, Exercisable, ending balance	$ 25.23
Weighted Average Remaining Term (Years), Outstanding	5 years 9 months 16 days
Weighted Average Remaining Term (Years), Exercisable	5 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 55,386
Aggregate Intrinsic Value, Exercisable	$ 37,980