Stock Benefit Plans (The Status Of Stock Option Awards) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Shares
Beginning balance (in shares) | shares	9,968,038
Granted (in shares) | shares	1,661,590
Exercised (in shares) | shares	(2,655,288)
Forfeited (in shares) | shares	(115,212)
Ending balance (in shares) | shares	8,859,128
Options vested or expected to vest (in shares) | shares	8,714,264
Options exercisable (in shares) | shares	5,133,064
Weighted Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 53.94
Granted (in dollars per share) | $ / shares	91.15
Exercised (in dollars per share) | $ / shares	40.10
Forfeited (in dollars per share) | $ / shares	82.96
Ending balance (in dollars per share) | $ / shares	64.69
Options vested or expected to vest (in dollars per share) | $ / shares	64.43
Options exercisable (in dollars per share) | $ / shares	$ 52.36
Weighted Average Remaining Contractual Term
Ending balance (term)	6 years 2 months 12 days
Options vested or expected to vest (term)	6 years 1 month 6 days
Options exercisable (term)	4 years 8 months 12 days
Aggregate Intrinsic Value
Ending balance | $	$ 414,756
Options vested or expected to vest | $	410,231
Options exercisable | $	$ 303,612