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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Income available to common shareholders, basic	$ 32,707	$ 134,748	$ 204,959	$ 281,907
Income available to common shareholders including assumed conversions, diluted	$ 32,707	$ 134,748	$ 204,959	$ 281,907
Basic weighted average shares outstanding	300,737	304,776	302,723	307,256
Stock options and non-vested shares, incremental shares	2,854	1,941	3,079	2,264
Diluted weighted average shares outstanding	303,591	306,717	305,802	309,520
Basic earnings per share	$ 0.11	$ 0.44	$ 0.68	$ 0.92
Diluted earnings per share	$ 0.11	$ 0.44	$ 0.67	$ 0.91