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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]        
Number of common share equivalent securities excluded from the diluted earnings per share calculation 2,000 2,200 2,000 2,200
Income from continuing operations attributable to common shareholders $ 42,399 $ 38,671 $ 81,012 $ 78,066
Amount allocated to participating securities (117) (282) (186) (547)
Net income attributable to common shareholders – basic $ 42,282 $ 38,389 $ 80,826 $ 77,519
Total earnings per common share – basic $ 0.43 $ 0.40 $ 0.83 $ 0.81
Net income attributable to common shareholders – diluted $ 42,282 $ 38,389 $ 80,826 $ 77,519
Total earnings per common share – diluted $ 0.43 $ 0.40 $ 0.82 $ 0.81
Weighted average number of common shares outstanding – basic 98,903 95,243 97,903 95,155
Common share options and share awards granted 94 94 121 134
Weighted average number of common shares outstanding – diluted 98,997 95,337 98,024 95,289