Earnings Per Share (Schedule Of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share
Income from continuing operations	$ 33,893	$ 30,644	$ 65,856	$ 60,975
Dividends on preferred shares	(135)	(135)	(271)	(271)
Less: Income from continuing operations attributable to noncontrolling interests	(1,504)	(1,254)	(2,692)	(2,588)
Less: Earnings allocated to unvested shares	(125)	(133)	(316)	(267)
Income from continuing operations available for common shareholders	32,129	29,122	62,577	57,849
Results from discontinued operations attributable to the Trust	2,368	1,314	2,779	1,537
Gain on sale of real estate		410		410
Net income available for common shareholders, basic and diluted	34,497	30,846	65,356	59,796
Weighted average common shares outstanding-basic	62,214	61,169	61,844	61,129
Stock options	177	142	168	137
Weighted average common shares outstanding-diluted	62,391	61,311	62,012	61,266
Continuing operations	$ 0.51	$ 0.47	$ 1.01	$ 0.95
Discontinued operations	$ 0.04	$ 0.02	$ 0.05	$ 0.02
Gain on sale of real estate		$ 0.01		$ 0.01
Earnings Per Share, Basic, Total	$ 0.55	$ 0.50	$ 1.06	$ 0.98
Continuing operations	$ 0.51	$ 0.47	$ 1.00	$ 0.95
Discontinued operations	$ 0.04	$ 0.02	$ 0.05	$ 0.02
Gain on sale of real estate		$ 0.01		$ 0.01
Earnings Per Share, Diluted, Total	$ 0.55	$ 0.50	$ 1.05	$ 0.98
Income from continuing operations attributable to the Trust	$ 32,389	$ 29,390	$ 63,164	$ 58,387

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