Consolidated Statements Of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Shares [Member] Class A Common Shares [Member] USD ($)	Common Shares [Member]	Preferred Shares [Member] USD ($)	Additional Paid-In Capital [Member] USD ($)	Accumulated Other Comprehensive Loss [Member] USD ($)	Distributions in Excess of Net Earnings [Member] USD ($)	Total Shareholders' Equity [Member] USD ($)	Noncontrolling Interests Shares [Member]	Noncontrolling Interests Common Units [Member] USD ($)	Noncontrolling Interests Consolidated Joint Ventures [Member] USD ($)	Noncontrolling Interests Consolidated Variable Interest Entity [Member] USD ($)	Noncontrolling Interests [Member] USD ($)	Redeemable Noncontrolling Interests Shares [Member] USD ($)	Total USD ($)
Balance at Dec. 31, 2012	$ 1,986		$ 70	$ 1,178,292	$ (1,786)	$ (348,734)	$ 829,828		$ 15,484	$ 476	$ 15,960	$ 845,788	$ 15,321
Balance (in shares) at Dec. 31, 2012		198,672,356	7,000,000					4,048,254					3,064,252
Unit Conversion/Redemption	1			(234)			(233)		(767)		(767)	(1,000)
Unit Conversion/Redemption (in shares)		27,790						(197,790)
Reallocation of Noncontrolling Interest									15,251		15,251	15,251	(15,251)
Reallocation of Noncontrolling Interest (in shares)								3,064,252					(3,064,252)
Preferred Stock
Preferred Shares Offering, net of costs			30	72,341			72,371					72,371
Preferred Shares Redemption			(24)	(59,976)			(60,000)					(60,000)
Dividends and Distributions declared:
Common Shares ($0.12 per share)						(25,414)	(25,414)					(25,414)
Preferred Shares						(7,433)	(7,433)					(7,433)
Common Units ($0.12 per share)									(838)		(838)	(838)
Dividend Reinvestment Plan				19			19					19		19
Dividend Reinvestment Plan (in shares)		3,571
Share Based Compensation
Grants	40			285			325					325
Grants (in shares)		3,963,929
Amortization				6,187			6,187					6,187
Change in Fair Value of Derivative Instruments					2,363		2,363					2,363
Net Income						10,872	10,872		37	(430)	(393)	10,479	(70)
Balance at Jun. 30, 2013	2,027		76	1,196,914	577	(370,709)	828,885		29,167	46	29,213	858,098
Balance (in shares) at Jun. 30, 2013		202,667,646	7,000,000					6,914,716
Balance at Dec. 31, 2013	2,028		76	1,200,798	(376)	(364,568)	837,958		29,523	(342)	29,181	867,139		867,139
Balance (in shares) at Dec. 31, 2013		202,759,419	7,600,000					6,914,716
Repurchase of Common Shares	(26)			(13,686)		(1,621)	(15,333)					(15,333)		15,284
Repurchase of Common Shares (in shares)		(2,626,854)												(2,626,854)
Dividends and Distributions declared:
Common Shares ($0.12 per share)						(24,120)	(24,120)					(24,120)
Preferred Shares						(7,178)	(7,178)					(7,178)
Common Units ($0.12 per share)									(830)		(830)	(830)
Dividend Reinvestment Plan				23			23					23		23
Dividend Reinvestment Plan (in shares)		4,310
Share Based Compensation
Grants	5			494			499					499
Grants (in shares)		539,875
Amortization				3,246			3,246					3,246
Change in Fair Value of Derivative Instruments					(518)		(518)					(518)
Net Income						50,925	50,925		1,516	(368)	1,148	52,073
Balance at Jun. 30, 2014	$ 2,007		$ 76	$ 1,190,875	$ (894)	$ (346,562)	$ 845,502		$ 30,209	$ (710)	$ 29,499	$ 875,001		$ 875,001
Balance (in shares) at Jun. 30, 2014		200,676,750	7,600,000					6,914,716