Earnings Per Share ("EPS") (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income		$ 160,816	$ 198,077	$ 334,365	$ 371,092
Preferred dividends		9,321	8,289	18,641	16,578
Net income available to common shareholders		$ 151,495	$ 189,788	$ 315,724	$ 354,514
Average shares used in basic computation		109,083,000	107,837,000	109,144,000	107,795,000
Dilutive effect of stock options and units	[1]	8,317,000	10,765,000	8,694,000	10,484,000
Average shares used in diluted computation		117,400,000	118,602,000	117,838,000	118,279,000
Basic		$ 1.39	$ 1.76	$ 2.89	$ 3.29
Diluted		$ 1.29	$ 1.60	$ 2.68	$ 3.00

[1] Diluted earnings per share is computed on the basis of the weighted-average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include units.