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Per Share Data (Tables)
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Calculation Of Basic And Diluted Earnings Per Share The following table presents information necessary to calculate basic and diluted earnings per share for the periods indicated:
 Three Months Ended
March 31,
(in thousands, except per share amounts)20212020
Earnings per common share calculation – basic
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 
Weighted average number of common shares outstanding – basic99,547 99,298 
Earnings per common share calculation – diluted
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 
Incremental shares issuable from assumed conversion of:
Common share options and share awards granted74 82 
Weighted average number of common shares outstanding – diluted
99,621 99,380