Earnings Per Share ("EPS") (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income		$ 662,155	$ 824,858	$ 503,472
Preferred dividends		37,281	35,587	27,261
Net income available to common shareholders		$ 624,874	$ 789,271	$ 476,211
Average shares used in basic computation		108,848	107,536	106,174
Dilutive effect of stock options and units	[1]	8,692	10,994	8,399
Average shares used in diluted computation		117,540	118,530	114,573
Basic		$ 5.74	$ 7.34	$ 4.49
Diluted		$ 5.32	$ 6.66	$ 4.16

[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.