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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]    
Net income $ 157,539 $ 173,549
Preferred dividends 9,320 9,320
Net income available to common shareholders $ 148,219 $ 164,229
Average shares used in basic computation 108,754 109,205
Dilutive effect of stock options and units 6,636 8,935 [1]
Average shares used in diluted computation 115,390 118,140
Basic $ 1.36 $ 1.50
Diluted $ 1.28 $ 1.39
[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.