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, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share [Abstract]
Net Income (Loss)		$ 522,536	$ 662,155	$ 824,858
Preferred dividends		37,281	37,281	35,587
Net income available to common shareholders		$ 485,255	$ 624,874	$ 789,271
Average shares used in basic computation		106,661	108,848	107,536
Dilutive effect of stock options and units	[1]	6,792	8,692	10,994
Average shares used in diluted computation		113,453	117,540	118,530
Basic		$ 4.55	$ 5.74	$ 7.34
Diluted		$ 4.28	$ 5.32	$ 6.66

[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.