Stockholders' Equity (Summary Of Activity Related To Stock Option Plans) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Available for Grant, Beginning Balance	4,049,037
Options Outstanding, Number of Shares, Beginning Balance	4,572,952
Options Outstanding, Number of Shares, Granted	406,292
Options Outstanding, Number of Shares, Exercised	(1,004,266)
Shares Available for Grant, Ending Balance	3,642,745
Options Outstanding, Number of Shares, Ending Balance	3,974,978
Options Outstanding, Number of Shares, Vested and exercisable	3,974,978
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Options Outstanding, Weighted-Average Exercise Price, Beginning Balance	$ 71.33
Options Outstanding, Weighted-Average Exercise Price, Granted	$ 162.52
Options Outstanding, Weighted-Average Exercise Price, Exercised	$ 67.70
Options Outstanding, Weighted-Average Exercise Price, Ending Balance	$ 81.57
Options Outstanding, Weighted-Average Exercise Price, Vested and exercisable	$ 81.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Term, Ending Balance	6 years 5 months 27 days
Weighted-Average Remaining Contractual Term, Vested and exercisable	6 years 5 months 27 days
Aggregate Intrinsic Value, Ending Balance	$ 524,708
Aggregate Intrinsic Value, Vested and exercisable	$ 524,708