Beneficiaries Equity of The Parent Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Preferred Units [Line Items]
Preferred shares, dividend rate (as a percent)									6.90%
Numerator
Income (loss) from continuing operations, Basic									$ 38,982	$ (37,309)	$ (24,556)
Income (loss) from continuing operations, Diluted									38,982	(37,309)	(24,556)
Net income (loss) from continuing operations attributable to non-controlling interests, Basic									(357)	863	994
Net income (loss) from continuing operations attributable to non-controlling interests, Diluted									(357)	863	994
Amount allocated to unvested restricted shareholders/unitholders, Basic									(363)	(376)	(505)
Amount allocable to unvested restricted shareholders, Diluted									(363)	(376)	(505)
Preferred share/unit dividends, Basic									(6,900)	(10,405)	(7,992)
Preferred share/unit dividends, Diluted									(6,900)	(10,405)	(7,992)
Preferred share/unit redemption premium, basic									0	(4,052)	0
Preferred share/unit redemption Premium, Diluted									0	(4,052)	0
Income Loss from continuing operations available to common shareholders/unitholders, Basic									31,362	(51,279)	(32,059)
Income (loss) from continuing operations available to common unit holders, Diluted									31,362	(51,279)	(32,059)
Discontinued operations attributable to common unitholders									4,207	43,838	19,841
Income (loss) from discontinued operations, Diluted									4,207	43,838	19,841
Discontinued operations attributable to non-controlling interests - LP units									(55)	(797)	(778)
Discontinued operations attributable to non-controlling interests, diluted									(55)	(797)	(778)
Discontinued operations attributable to common shareholders, Basic									4,152	43,041	19,063
Discontinued operations attributable to common shareholders, Diluted									4,152	43,041	19,063
Net income (loss) attributable to Common Shareholders/Unitholders									35,514	(8,238)	(12,996)
Net income (loss) available to common shareholders/unitholders, Diluted									$ 35,514	$ (8,238)	$ (12,996)
Denominator
Weighted-average shares/units outstanding, Basic									153,140,458	143,257,097	135,444,424
Contingent securities/Stock based compensation									1,273,853	0	0
Weighted-average shares/units outstanding, Diluted									154,414,311	143,257,097	135,444,424
Earnings per Common Share:
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Basic									$ 0.20	$ (0.36)	$ (0.24)
Income (Loss) from continuing operations attributable to common shareholders/unitholders, Diluted									$ 0.20	$ (0.36)	$ (0.24)
Discontinued operations attributable to common shareholders/unitholders, Basic									$ 0.03	$ 0.30	$ 0.14
Discontinued operations attributable to common shareholders, Diluted									$ 0.03	$ 0.30	$ 0.14
Net income (loss) attributable to common shareholders/unitholders, Basic	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)
Net income (loss) attributable to common shareholders/unitholders, Diluted	$ 0.12	$ 0.06	$ 0.03	$ 0.01	$ (0.21)	$ 0.10	$ 0.01	$ 0.05	$ 0.23	$ (0.06)	$ (0.10)