Shareholders' Equity (Summary Of Activity Under Stock Incentive Plans) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014
Number of Shares [Roll Forward]
Outstanding, Number of Shares, Beginning Balance	4,245,789
Granted, Number of Shares	487,521
Exercised, number of shares	(771,960)
Forfeited, Number of Shares	(221,049)
Expired, Number of Shares	(14,288)
Outstanding, Number of Shares, Ending Balance	3,726,013
Vested and expected to vest, end of period, Number of Shares	3,515,383
Exercisable, end of period, Number of Shares	2,025,802
Weighted Average Exercise Price [Roll Forward]
Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 29.30
Granted, Weighted Average Exercise Price	$ 79.58
Exercised, Weighted Average Exercise Price	$ 27.97
Forfeited, Weighted Average Exercise Price	$ 32.28
Expired, Weighted Average Exercise Price	$ 24.53
Outstanding, Weighted Average Exercise Price, Ending Balance	$ 35.99
Vested and expected to vest, end of period, Weighted Average Exercise Price	$ 35.20
Exercisable, end of period, Weighted Average Exercise Price	$ 27.19
Weighted Average Remaining Contractual Term [Abstract]
Outstanding, ending balance, Weighted Average Remaining Contractual Term	5 years 8 months 2 days
Vested and expected to vest, end of period, Weighted Average Remaining Contractual Term	5 years 7 months 7 days
Exercisable, end of period, Weighted Average Remaining Contractual Term	4 years 6 months 27 days
Outstanding, end of period, Aggregate Intrinsic Value	$ 124,242,124
Vested and expected to vest, end of period, Aggregate Intrinsic Value	119,462,871
Exercisable, end of period, Aggregate Intrinsic Value	$ 82,254,814