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, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Number of common share equivalent securities excluded from the diluted earnings per share calculation	1,600	1,700
Income from continuing operations attributable to common shareholders	$ 34,861	$ 36,654
Amount allocated to participating securities	(38)	(232)
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities	34,823	36,422
Income from discontinued operations attributable to common shareholders	0	5,076
Net income attributable to common shareholders – basic	$ 34,823	$ 41,498
Earnings per common share from continuing operations	$ 0.39	$ 0.41
Earnings per common share from discontinued operations	0.00	0.05
Total earnings per common share – basic	$ 0.39	$ 0.46
Weighted average number of common shares outstanding – basic	89,925	89,344
Income allocated to common units from continuing operations	$ 273	$ 328
Income from continuing operations attributable to common shareholders, as adjusted	35,096	36,750
Net income attributable to common shareholders – diluted	$ 35,096	$ 41,826
Earnings per common share from continuing operations	$ 0.39	$ 0.41
Earnings per common share from discontinued operations	0.00	0.05
Total earnings per common share – diluted	$ 0.39	$ 0.46
Common share options and share awards granted	218	355
Common units	806	810
Weighted average number of common shares outstanding – diluted	90,949	90,509

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method and incremental common shares attributable to participating nonvested shares with non-forfeitable dividend rights using the two class method.

No definition available.