CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY (USD $)	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Distributions in Excess of Accumulated Earnings	Accumulated Other Comprehensive Loss	Treasury Shares At Cost	Noncontrolling Interest
Balance at Dec. 31, 2010	$ 892,144,000	$ 0	$ 732,000	$ 1,608,014,000	$ (606,511,000)	$ (15,339,000)	$ (140,018,000)	$ 45,266,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Net of Issuance Costs	202,332,000		174,000	202,158,000
Stock Based Compensation Activity	2,759,000		4,000	3,088,000	(333,000)
Conversion of Units to Common Stock	0		1,000	1,108,000				(1,109,000)
Reallocation-Additional Paid in Capital	0			(3,019,000)				3,019,000
Preferred Dividends	(19,565,000)				(19,565,000)
Net Income (Loss)	(9,190,000)				(7,445,000)			(1,745,000)
Reallocation-Other Comprehensive Income	0					(237,000)		237,000
Other Comprehensive Income	4,115,000					3,864,000		251,000
Balance at Dec. 31, 2011	1,072,595,000	0	911,000	1,811,349,000	(633,854,000)	(11,712,000)	(140,018,000)	45,919,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Net of Issuance Costs	134,436,000		109,000	134,327,000
Redemption of Preferred Stock	(50,044,000)			(48,240,000)	(1,804,000)
Stock Based Compensation Activity	4,582,000		6,000	6,220,000	(1,644,000)
Conversion of Units to Common Stock	0		5,000	4,758,000				(4,763,000)
Reallocation-Additional Paid in Capital	0			(1,924,000)				1,924,000
Preferred Dividends	(18,947,000)				(18,947,000)
Net Income (Loss)	(2,519,000)				(1,318,000)			(1,201,000)
Reallocation-Other Comprehensive Income	0					(107,000)		107,000
Other Comprehensive Income	5,550,000					5,262,000		288,000
Balance at Dec. 31, 2012	1,145,653,000	0	1,031,000	1,906,490,000	(657,567,000)	(6,557,000)	(140,018,000)	42,274,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Net of Issuance Costs	173,785,000		107,000	173,678,000
Redemption of Preferred Stock	(150,051,000)			(144,384,000)	(5,667,000)
Stock Based Compensation Activity	4,532,000		4,000	5,476,000	(948,000)
Conversion of Units to Common Stock	0		1,000	995,000				(996,000)
Reallocation-Additional Paid in Capital	0			(3,369,000)				3,369,000
Common Stock and Unit Distributions	(38,862,000)				(37,288,000)			(1,574,000)
Preferred Dividends	(8,733,000)				(8,733,000)
Net Income (Loss)	41,428,000				40,307,000			1,121,000
Reallocation-Other Comprehensive Income	0					(31,000)		31,000
Other Comprehensive Income	3,467,000					3,323,000		144,000
Balance at Dec. 31, 2013	$ 1,171,219,000	$ 0	$ 1,143,000	$ 1,938,886,000	$ (669,896,000)	$ (3,265,000)	$ (140,018,000)	$ 44,369,000