Earnings Per Share ("EPS") (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income		$ 68,161	$ 151,169	$ 360,052	$ 485,534
Preferred dividends		9,321	9,320	27,961	27,961
Net income available to common shareholders		$ 58,840	$ 141,849	$ 332,091	$ 457,573
Average shares used in basic computation		106,068	108,767	107,580	109,017
Dilutive effect of stock options and units	[1]	7,127	8,451	6,590	8,632
Average shares used in diluted computation		113,195	117,218	114,170	117,649
Basic		$ 0.55	$ 1.3	$ 3.09	$ 4.2
Diluted		$ 0.52	$ 1.21	$ 2.91	$ 3.89

[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.