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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Net income $ 173,549 $ 173,015
Preferred dividends 9,320 8,289
Net income available to common shareholders $ 164,229 $ 164,726
Average shares used in basic computation 109,205,000 107,746,000
Dilutive effect of stock options and units [1] 8,935,000 10,129,000
Average shares used in diluted computation 118,140,000 117,875,000
Basic $ 1.50 $ 1.53
Diluted $ 1.39 $ 1.40
[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.