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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
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Number of common share equivalent securities excluded from the diluted earnings per share calculation 1,900 1,900
Income from continuing operations attributable to common shareholders $ 31,347 $ 43,284
Amount allocated to participating securities (43) (99)
Net income attributable to common shareholders – basic $ 31,304 $ 43,185
Total earnings per common share – basic $ 0.31 $ 0.43
Net income attributable to common shareholders – diluted $ 31,304 $ 43,185
Total earnings per common share – diluted $ 0.31 $ 0.43
Weighted average number of common shares outstanding – basic 99,547 99,298
Common share options and share awards granted 74 82
Weighted average number of common shares outstanding – diluted 99,621 99,380