Consolidated Statements Of Equity (USD $)	Common Shares [Member] Class A Common Shares [Member] USD ($)	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	$ 1,986,000		$ 70,000	$ 1,178,292,000	$ (1,786,000)	$ (348,734,000)	$ 829,828,000		$ 15,484,000	$ 476,000	$ 15,960,000	$ 845,788,000	$ 3,064,252,000
Balance (in shares) at Dec. 31, 2012		198,672,356	7,000,000					4,048,254					15,321
Unit Conversion	1,000			69,000			70,000		(70,000)		(70,000)
Unit Conversion (in shares)		17,790						(17,790)
Reallocation of Noncontrolling Interest									15,251,000		15,251,000	15,251,000	(3,064,252,000)
Reallocation of Noncontrolling Interest (in shares)								3,064,252					(15,251)
Preferred Stock
Preferred Stock Offering, net of costs			30,000	72,389,000			72,419,000					72,419,000
Preferred Stock Redemption			(24,000)	(59,976,000)			(60,000,000)					(60,000,000)
Dividends and Distributions declared:
Common Stock ($0.06 per share)						(13,250,000)	(13,250,000)					(13,250,000)
Preferred Stock						(3,844,000)	(3,844,000)					(3,844,000)
Common Units ($0.06 per share)									(426,000)		(426,000)	(426,000)
Dividend Reinvestment Plan				10,000			10,000					10,000		10,000
Dividend Reinvestment Plan (in shares)		2,097
Stock Based Compensation
Grants	39,000			(39,000)
Grants (in shares)		3,860,907
Amortization				4,094,000			4,094,000					4,094,000
Change in Fair Value of Derivative Instruments					156,000		156,000					156,000
Net Loss						(7,003,000)	(7,003,000)		(402,000)	(201,000)	(603,000)	(7,606,000)	(70)
Balance at Mar. 31, 2013	2,026,000		76,000	1,194,839,000	(1,630,000)	(372,831,000)	822,480,000		29,837,000	275,000	30,112,000	852,592,000
Balance (in shares) at Mar. 31, 2013		202,553,150	7,000,000					7,094,716
Balance at Dec. 31, 2013	2,028,000		76,000	1,200,798,000	(376,000)	(364,568,000)	837,958,000		29,523,000	(342,000)	29,181,000	867,139,000		867,139,000
Balance (in shares) at Dec. 31, 2013		202,759,419	7,600,000					6,914,716
Repurchase of Common Stock	(26,000)			(13,637,000)		(1,621,000)	(15,284,000)					(15,284,000)		15,284,000
Repurchase of Common Stock (in shares)		(2,626,854)												(2,626,854)
Dividends and Distributions declared:
Common Stock ($0.06 per share)						(12,079,000)	(12,079,000)					(12,079,000)
Preferred Stock						(3,589,000)	(3,589,000)					(3,589,000)
Common Units ($0.06 per share)									(415,000)		(415,000)	(415,000)
Dividend Reinvestment Plan				11,000			11,000					11,000		11,000
Dividend Reinvestment Plan (in shares)		2,154
Stock Based Compensation
Grants	4,000			(4,000)
Grants (in shares)		487,989
Amortization				2,204,000			2,204,000					2,204,000
Change in Fair Value of Derivative Instruments					(100,000)		(100,000)					(100,000)
Net Loss						(6,006,000)	(6,006,000)		(331,000)	(176,000)	(507,000)	(6,513,000)
Balance at Mar. 31, 2014	$ 2,006,000		$ 76,000	$ 1,189,372,000	$ (476,000)	$ (387,863,000)	$ 803,115,000		$ 28,777,000	$ (518,000)	$ 28,259,000	$ 831,374,000		$ 831,374,000
Balance (in shares) at Mar. 31, 2014		200,622,708	7,600,000					6,914,716