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
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Income available to common shareholders, basic	$ 172,252	$ 147,159
Income available to common shareholders including assumed conversions, diluted	$ 172,252	$ 147,159
Basic weighted average shares outstanding	304,731	309,657
Stock options and non-vested shares, incremental shares	3,300	2,583
Diluted weighted average shares outstanding	308,031	312,240
Basic earnings per share	$ 0.57	$ 0.48
Diluted earnings per share	$ 0.56	$ 0.47