Stock-Based Compensation (Summary Of Stock Options) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of year, Weighted-Average Exercise Price	$ 51.07	$ 48.76	$ 44.77
Granted, Weighted-Average Exercise Price	94.38	88.10	81.09
Issued pursuant to acquisitions, Weighted-Average Exercise Price	0.00	12.26	23.26
Exercised, Weighted-Average Exercise Price	45.57	40.52	31.36
Forfeited, Weighted-Average Exercise Price	72.07	70.15	61.11
Outstanding, end of year, Weighted-Average Exercise Price	56.37	51.07	48.76
Vested and Exercisable, end of year, Weighted-Average Exercise Price	$ 51.80	$ 48.29	$ 44.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of year, Options	3,986	4,932	6,166
Granted, Options	260	57	150
Issued pursuant to acquisitions, Options	0	8	21
Exercised, Options	(1,082)	(975)	(1,266)
Forfeited, Options	(28)	(36)	(139)
Outstanding, end of year, Options	3,136	3,986	4,932
Vested and Exercisable, end of year, Options	2,762	3,539	3,958
Outstanding, Weighted-Average Remaining Contractual Term (in years)	4 years 7 months 14 days	4 years 10 months 5 days	5 years 6 months 12 days
Vested and Exercisable, Weighted-Average Remaining Contractual Term (in years)	4 years 15 days	4 years 6 months 12 days	5 years
Outstanding, Aggregate Intrinsic Value	$ 113,822	$ 165,131	$ 163,932
Vested and Exercisable, Aggregate Intrinsic Value	$ 112,379	$ 156,487	$ 149,536