Share-Based Compensation and Benefit Plans (Summary Of Stock Options) (Details) - Stock option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-Based Compensation and Benefit Plans
Exercisable at the end of the year, average remaining contractual term	4 years 2 months 5 days	4 years 6 months 21 days	4 years 9 months 9 days
Employee stock option [Member]
Share-Based Compensation and Benefit Plans
Outstanding beginning balance, shares	4,025
Outstanding at the beginning of the year, weighted-average exercise price	$ 64.82
Granted, shares	317
Granted, weighted-average exercise price	$ 211.64
Exercised, shares	(953)
Exercised, weighted-average exercise price	$ 54.71
Forfeited, shares	(98)
Forfeited, weighted-average exercise price	$ 93.65
Outstanding ending balance, shares	3,291	4,025
Outstanding at the end of the year, weighted-average exercise price	$ 81.04	$ 64.82
Outstanding at the end of the year, average remaining contractual term	5 years 4 months 3 days
Outstanding at the end of the year, aggregate intrinsic value	$ 567,333
Vested or expected to vest at the end of the year, shares	3,216
Vested or expected to vest at the end of the year, weighted-average exercise price	$ 79.75
Vested or expected to vest at the end of the year, average remaining contractual term	5 years 3 months 13 days
Vested or expected to vest at the end of the year, aggregate intrinsic value	$ 558,536
Exercisable at the end of the year, shares	2,308
Exercisable at the end of the year, weighted-average exercise price	$ 52.54
Exercisable at the end of the year, average remaining contractual term	4 years 2 months 13 days
Exercisable at the end of the year, aggregate intrinsic value	$ 463,671
Director [Member]
Share-Based Compensation and Benefit Plans
Outstanding beginning balance, shares	40
Outstanding at the beginning of the year, weighted-average exercise price	$ 39.19
Granted, shares	0
Granted, weighted-average exercise price	$ 0.00
Exercised, shares	(23)
Exercised, weighted-average exercise price	$ 34.80
Forfeited, shares	0
Forfeited, weighted-average exercise price	$ 0.00
Outstanding ending balance, shares	17	40
Outstanding at the end of the year, weighted-average exercise price	$ 45.13	$ 39.19
Outstanding at the end of the year, average remaining contractual term	1 year 19 days
Outstanding at the end of the year, aggregate intrinsic value	$ 3,541
Vested or expected to vest at the end of the year, shares	17
Vested or expected to vest at the end of the year, weighted-average exercise price	$ 45.13
Vested or expected to vest at the end of the year, average remaining contractual term	1 year 19 days
Vested or expected to vest at the end of the year, aggregate intrinsic value	$ 3,541
Exercisable at the end of the year, shares	17
Exercisable at the end of the year, weighted-average exercise price	$ 45.13
Exercisable at the end of the year, average remaining contractual term	1 year 19 days
Exercisable at the end of the year, aggregate intrinsic value	$ 3,541