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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share [Abstract]        
Number of common share equivalent securities excluded from the diluted earnings per share calculation 2,200 1,500 2,200 1,500
Income from continuing operations attributable to common shareholders $ 38,671 $ 39,188 $ 78,066 $ 74,049
Amount allocated to participating securities (282) (74) (547) (112)
Net income attributable to common shareholders – basic $ 38,389 $ 39,114 $ 77,519 $ 73,937
Total earnings per common share – basic $ 0.40 $ 0.43 $ 0.81 $ 0.82
Weighted average number of common shares outstanding – basic 95,243 90,105 95,155 90,015
Income Loss From Continuing Operations After Adjustment for Amount Allocated To Participating Securities $ 38,389 $ 39,114 $ 77,519 $ 73,937
Income allocated to common units from continuing operations 0 302 0 575
Net income attributable to common shareholders – diluted $ 38,389 $ 39,416 $ 77,519 $ 74,512
Total earnings per common share – diluted $ 0.40 $ 0.43 $ 0.81 $ 0.82
Common share options and share awards granted 94 131 134 175
Common units 0 805 0 805
Weighted average number of common shares outstanding – diluted 95,337 91,041 95,289 90,995