Per Share Data (Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Number of common share equivalent securities excluded from the diluted earnings per share calculation	1,000	1,000	1,900
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent	$ 653,613	$ 303,907	$ 123,911
Amount allocated to participating securities	(990)	(545)	(261)
Net Income (Loss) Available to Common Stockholders, Basic	$ 652,623	$ 303,362	$ 123,650
Total earnings per common share - basic	$ 6.07	$ 2.97	$ 1.24
Weighted average number of common shares outstanding – basic	107,605	101,999	99,385
Income allocated to common units from continuing operations	$ 1,452	$ 1,190	$ 0
Net income attributable to common shareholders - diluted	$ 654,075	$ 304,552	$ 123,650
Total earnings per common share - diluted	$ 6.04	$ 2.96	$ 1.24
Common share options and share awards granted	50	87	53
Common units	733	743	0
Weighted average number of common shares outstanding - diluted	108,388	102,829	99,438