Beneficiaries Equity of the Parent Company - Number of Shares and Net Income Used to Calculate Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator
Income from continuing operations	$ 7,884	$ 20,308	$ 52,871	$ 31,960
Net income from continuing operations attributable to non-controlling interests	(58)	(161)	(425)	(221)
Nonforfeitable dividends allocated to unvested restricted shareholders	(79)	(76)	(263)	(253)
Distribution to preferred shareholders	(1,725)	(1,725)	(5,175)	(5,175)
Net income attributable to Common Share/Unit holders of entity	6,022	18,346	47,008	26,311
Net income attributable to common share/unit holders, Diluted	$ 6,022	$ 18,346	$ 47,008	$ 26,311
Denominator
Basic weighted average shares outstanding (in shares)	175,127,110	178,188,037	174,976,998	179,198,714
Contingent securities/Share based compensation (in shares)	1,237,505	588,647	1,032,824	789,778
Diluted weighted average shares outstanding (in shares)	176,364,615	178,776,684	176,009,822	179,988,492
Earnings per Common Share:
Net income attributable to common shareholders, Basic (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15
Net income attributable to common shareholders, Diluted (USD per share)	$ 0.03	$ 0.10	$ 0.27	$ 0.15