Earnings Per Share (Reconciliation Of The Numerators And The Denominators Of The Basic And Diluted Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Income available to common shareholders, basic	$ 175,795	$ 356,676	$ 380,754	$ 638,583
Income available to common shareholders including assumed conversions, diluted	$ 175,795	$ 356,676	$ 380,754	$ 638,583
Basic weighted average shares outstanding	296,202	305,759	300,526	306,759
Stock options and non-vested shares, incremental shares	2,512	2,607	2,897	2,365
Diluted weighted average shares outstanding	298,714	308,366	303,423	309,124
Basic earnings per share	$ 0.59	$ 1.17	$ 1.27	$ 2.08
Diluted earnings per share	$ 0.59	$ 1.16	$ 1.25	$ 2.07