Share-Based Compensation (Schedule Of Stock Option Activity) (Details) - $ / shares	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding beginning balance (in shares)	2,447,171	2,216,175
Options granted (in shares)		385,500
Options forfeited (in shares)		(25,000)
Options expired (in shares)	(301,837)
Options outstanding, ending balance (in shares)	2,576,334	2,516,673
Stock Options Weighted Average Exercise Price
Options outstanding (in dollars per share)	$ 68.80	$ 70.97
Options granted (in dollars per share)		54.73
Options forfeited (in dollars per share)		74.67
Options expired (in dollars per share)	79.96
Options outstanding (in dollars per share)	$ 65.89	$ 68.61
Stock Options Additional Disclosures
Options exercisable (in shares)	2,235,640	2,132,828
Options exercisable (in dollars per share)	$ 66.99	$ 71.21
Options outstanding (in years)	2 years 8 months 26 days
Options exercisable (in years)	2 years 5 months 12 days
2019 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options granted (in shares)	431,000
Options expired (in shares)		(60,002)
Stock Options Weighted Average Exercise Price
Options granted (in dollars per share)	$ 57.76
Options expired (in dollars per share)		$ 64.33