(Summary Of Activity Of Restricted Stock Award Program) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/units, outstanding	5,766,477	5,799,884	5,950,130
Shares/units, granted	2,353,613	1,751,235	2,163,912
Shares/units, shares issued	(2,367,135)	(1,588,642)	(1,876,134)
Shares/units, forfeited	(238,227)	(196,000)	(438,024)
Shares/Units, outstanding	5,514,728	5,766,477	5,799,884
Weighted average grant date fair value, outstanding	$ 38.79	$ 36.17	$ 35.89
Weighted average grant date fair value, granted	43.49	62.97	51.78
Weighted average grant date fair value, shares issued	36.79	53.67	51.00
Weighted average grant date fair value, forfeited	50.64	56.57	45.96
Weighted average grant date fair value, outstanding	$ 41.14	$ 38.79	$ 36.17
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares/units, outstanding	132,111	166,300	169,331
Shares/units, granted	87,910	66,100	63,319
Shares/units, shares issued	(52,021)	(100,289)	(59,650)
Shares/units, forfeited	(7,300)	0	(6,700)
Shares/Units, outstanding	160,700	132,111	166,300
Weighted average grant date fair value, outstanding	$ 50.17	$ 48.63	$ 45.34
Weighted average grant date fair value, granted	43.70	51.43	57.24
Weighted average grant date fair value, shares issued	48.90	48.44	47.90
Weighted average grant date fair value, forfeited	45.10	0	53.53
Weighted average grant date fair value, outstanding	$ 47.27	$ 50.17	$ 48.63