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Stockholder's Equity (Summary Of Stock Option Plan Activity) (Details) - $ / shares	12 Months Ended			104 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Options Outstanding
Granted (in shares)				13,104,021
Exercised (in shares)	(1,630,664)	(2,325,073)	(620,766)
Outstanding as of End of Period (in shares)	5,914,757			5,914,757
Options Exercisable (in shares)	1,885,241			1,885,241
Stock Option Plan
Options Outstanding
Outstanding as of Beginning of Period (in shares)	6,807,217	7,999,264
Granted (in shares)	902,263	1,316,924
Exercised (in shares)	(1,630,664)	(2,325,073)
Cancelled/forfeited (in shares)	(164,059)	(183,898)
Outstanding as of End of Period (in shares)	5,914,757	6,807,217	7,999,264	5,914,757
Options Exercisable (in shares)	1,885,241	2,164,067		1,885,241
Exercise Price
Outstanding as of Beginning of Period (in dollars per share)	$ 24.890	$ 24.765
Granted (in dollars per share)	38.000	26.000
Exercised (in dollars per share)	25.180	25.150
Cancelled/forfeited (in dollars per share)	27.640	24.630
Outstanding as of End of Period (in dollars per share)	26.730	24.890	$ 24.765	$ 26.730
Exercisable (in dollars per share)	$ 24.230	$ 24.510		$ 24.230
Remaining Life
Outstanding	6 years 2 months 19 days	6 years 1 month 2 days	5 years 7 months 9 days
Granted	9 years	9 years
Exercisable	4 years 8 months 15 days	4 years 3 months 18 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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