Per Share Data (Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Number of common share equivalent securities excluded from the diluted earnings per share calculation	100	1,800	100	1,900
Income from continuing operations attributable to common shareholders	$ 497,315	$ 30,179	$ 578,060	$ 61,526
Amount allocated to participating securities	(740)	(50)	(900)	(82)
Net income attributable to common shareholders – basic	$ 496,575	$ 30,129	$ 577,160	$ 61,444
Total earnings per common share – basic	$ 4.59	$ 0.30	$ 5.41	$ 0.61
Income allocated to common units from continuing operations	$ 1,571	$ 0	$ 4,427	$ 0
Net income attributable to common shareholders – diluted	$ 498,146	$ 30,129	$ 581,587	$ 61,444
Total earnings per common share – diluted	$ 4.54	$ 0.30	$ 5.37	$ 0.61
Weighted average number of common shares outstanding – basic	108,106	100,701	106,729	100,127
Incremental share awards granted	33	66	58	70
Incremental Common Units	1,606	0	1,606	0
Weighted average number of common shares outstanding – diluted	109,745	100,767	108,393	100,197