Share-Based Compensation (Schedule Of Stock Option Activity) (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-Based Compensation [Abstract]
Outstanding as of December 31, 2014 | shares	3,384
Granted | shares	745
Exercised | shares	(838)
Forfeited | shares	(115)
Outstanding as of December 31, 2015 | shares	3,176
Fully vested as of December 31, 2015 | shares	1,510
Fully vested and expected to vest as of December 31, 2015 | shares	3,034
Weighted average exercise price of beginning balance of options outstanding | $ / shares	$ 49.76
Weighted average exercise price of options granted | $ / shares	69.07
Weighted average exercise price of options exercised | $ / shares	37.04
Weighted average exercise price of options forfeited | $ / shares	59.34
Weighted average exercise price of ending balance of options outstanding | $ / shares	57.31
Weighted average exercise price of options fully vested | $ / shares	46.92
Weighted average exercise price of options fully vested and expected to vest | $ / shares	$ 56.78
Weighted average remaining contractual term of ending balance of options outstanding	5 years 3 months 18 days
Weighted average remaining contractual term of options fully vested	3 years 2 months 12 days
Weighted average remaining contractual term of options fully vested and expected to vest	5 years 2 months 12 days
Aggregate Intrinsic Value | $	$ 190,424
Aggregate intrinsic value of options fully vested | $	106,255
Aggregate intrinsic value of options expected to vest | $	$ 183,550