Stock-Based Compensation (Summary Of Stock Options) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of period, Weighted-Average Exercise Price	$ 48.76	$ 44.77	$ 42.85
Granted, Weighted-Average Exercise Price	88.10	81.09	81.87
Issued pursuant to acquisitions, Weighted-Average Exercise Price	12.26	23.26	0.00
Exercised, Weighted-Average Exercise Price	40.52	31.36	34.26
Forfeited, Weighted-Average Exercise Price	70.15	61.11	53.75
Outstanding, end of period, Weighted-Average Exercise Price	51.07	48.76	44.77
Vested and Exercisable, end of period, Weighted-Average Exercise Price	$ 48.29	$ 44.22	$ 38.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of year, Options	4,932	6,166	7,122
Granted, Options	57	150	103
Issued pursuant to acquisitions, Options	8	21	0
Exercised, Options	(975)	(1,266)	(993)
Forfeited, Options	(36)	(139)	(66)
Outstanding, end of year, Options	3,986	4,932	6,166
Vested and Exercisable, end of year, Options	3,539	3,958	4,351
Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 10 months 5 days	5 years 6 months 12 days	5 years 11 months 25 days
Vested and Exercisable, Weighted-Average Remaining Contractual Term (in years)	4 years 6 months 12 days	5 years	5 years 1 month 18 days
Outstanding, Aggregate Intrinsic Value	$ 165,131	$ 163,932	$ 261,601
Vested and Exercisable, Aggregate Intrinsic Value	$ 156,487	$ 149,536	$ 213,304