Per Share Data (Calculation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Per Share Data
Income from continuing operations attributable to common shareholders	$ 11,840	$ 569	$ 2,529	$ 3,326
Amount allocated to participating securities	(154)	(24)	(118)	(94)
Net income attributable to common shareholders, as adjusted	11,686	1,626	2,411	5,975
Income from continuing operations attributable to common shareholders, as adjusted - per share	$ 0.16	$ 0.01	$ 0.03	$ 0.05
Net income attributable to common shareholders, as adjusted - per share	$ 0.16	$ 0.02	$ 0.03	$ 0.09
Income from continuing operations attributable to common shareholders, net of amount allocated to participating securities	11,686	545	2,411	3,232
Income allocated to common units	$ 8
Income from continuing operations attributable to common shareholders, as adjusted	11,694	545	2,411	3,232
Income from discontinued operations attributable to common shareholders		1,081		2,743
Net income attributable to common shareholders, as adjusted	$ 11,694	$ 1,626	$ 2,411	$ 5,975
Income from continuing operations attributable to common shareholders, as adjusted - per share	$ 0.16	$ 0.01	$ 0.03	$ 0.05
Income from discontinued operations attributable to common shareholders - per share		$ 0.01		$ 0.04
Net income attributable to common shareholders, as adjusted - per share	$ 0.16	$ 0.02	$ 0.03	$ 0.09
Weighted average number of common shares outstanding - basic	73,242,000	69,100,000	72,502,000	67,898,000
Common share options and share awards granted	793,000	341,000	715,000	271,000
Common units	239,000
Weighted average number of common shares outstanding - diluted	74,274,000	69,441,000	73,217,000	68,169,000
Number of common share equivalent securities excluded from the diluted earnings per share calculation	3,700,000	4,700,000	4,100,000	5,000,000