Beneficiaries Equity of The Parent Company (Details) (USD $) In Thousands, except Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Numerator
Loss from continuing operations, Basic	$ (10,127)	$ (5,868)	$ (10,623)	$ (13,023)
Loss from continuing operations, Diluted	(10,127)	(5,868)	(10,623)	(13,023)
Net loss from continuing operations attributable to non-controlling interests, Basic	243	165	294	360
Net loss from continuing operations attributable to non-controlling interests, Diluted	243	165	294	360
Amount allocable to unvested restricted shareholders, Basic	(121)	(128)	(263)	(256)
Amount allocable to unvested restricted shareholders, Diluted	(121)	(128)	(263)	(256)
Distribution to Preferred Shares	(1,998)	(1,998)	(3,996)	(3,996)
Preferred share dividends, Diluted	(1,998)	(1,998)	(3,996)	(3,996)
Loss from continuing operations available to common shareholders, Basic	(12,003)	(7,829)	(14,588)	(16,915)
Loss from continuing operations available to common shareholders, Diluted	(12,003)	(7,829)	(14,588)	(16,915)
Income from discontinued operations	3,893	268	3,899	7,024
Income (loss) from discontinued operations, Diluted	3,893	268	3,899	7,024
Net income from discontinued operations attributable to non-controlling interests - LP units	(78)	(6)	(78)	(150)
Discontinued operations attributable to non-controlling interests, diluted	(78)	(6)	(78)	(150)
Discontinued operations attributable to common shareholders, Basic	3,815	262	3,821	6,874
Discontinued operations attributable to common shareholders, Diluted	3,815	262	3,821	6,874
Net loss attributable to common shareholders, Basic	(8,188)	(7,567)	(10,767)	(10,041)
Net loss attributable to common shareholders, Diluted	$ (8,188)	$ (7,567)	$ (10,767)	$ (10,041)
Denominator
Weighted-average shares outstanding, Basic	135,342,538	131,510,924	134,962,093	130,146,853
Weighted-average shares outstanding, Diluted	135,342,538	131,510,924	134,962,093	130,146,853
Earnings per Common Share:
Loss from continuing operations attributable to common shareholders, Basic	$ (0.09)	$ (0.06)	$ (0.11)	$ (0.13)
Loss from continuing operations attributable to common shareholders, Diluted	$ (0.09)	$ (0.06)	$ (0.11)	$ (0.13)
Discontinued operations attributable to common shareholders, Basic	$ 0.03	$ 0.00	$ 0.03	$ 0.05
Discontinued operations attributable to common shareholders, Diluted	$ 0.03	$ 0.00	$ 0.03	$ 0.05
Net loss attributable to common shareholders, Basic	$ (0.06)	$ (0.06)	$ (0.08)	$ (0.08)
Net loss attributable to common shareholders, Diluted	$ (0.06)	$ (0.06)	$ (0.08)	$ (0.08)