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		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income		$ 134,352	$ 160,816	$ 291,891	$ 334,365
Preferred dividends		9,320	9,321	18,640	18,641
Net income available to common shareholders		$ 125,032	$ 151,495	$ 273,251	$ 315,724
Average shares used in basic computation		107,944	109,083	108,360	109,144
Dilutive effect of stock options and units	[1]	5,920	8,317	6,298	8,694
Average shares used in diluted computation		113,864	117,400	114,658	117,838
Basic		$ 1.16	$ 1.39	$ 2.52	$ 2.89
Diluted		$ 1.1	$ 1.29	$ 2.38	$ 2.68

[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.