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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Number of common share equivalent securities excluded from the diluted earnings per share calculation 1,000 1,900 1,100
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent $ 303,907 $ 123,911 $ 219,623
Amount allocated to participating securities (545) (261) (539)
Net Income (Loss) Available to Common Stockholders, Basic $ 303,362 $ 123,650 $ 219,084
Total earnings per common share - basic $ 2.97 $ 1.24 $ 2.23
Weighted average number of common shares outstanding – basic 101,999 99,385 98,460
Income allocated to common units from continuing operations $ 1,190 $ 0 $ 1,593
Net income attributable to common shareholders - diluted $ 304,552 $ 123,650 $ 220,677
Total earnings per common share - diluted $ 2.96 $ 1.24 $ 2.22
Common share options and share awards granted 87 53 119
Common units 743 0 805
Weighted average number of common shares outstanding - diluted 102,829 99,438 99,384