CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS EQUITY (USD $) In Thousands, unless otherwise specified	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, 2012	$ 1,145,653	$ 0	$ 1,031	$ 1,906,490	$ (657,567)	$ (6,557)	$ (140,018)	$ 42,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock, Net of Issuance Costs	173,785		107	173,678
Redemption of Preferred Stock	(150,051)			(144,384)	(5,667)
Stock Based Compensation Activity	2,755		4	3,699	(948)
Conversion of Units to Common Stock	0		1	942				(943)
Reallocation—Additional Paid in Capital				(3,325)				3,325
Common Stock and Unit Distributions	(29,074)				(27,891)			(1,183)
Preferred Dividends	(7,506)				(7,506)
Net Income	19,002				18,758			244
Reallocation—Other Comprehensive Income						(31)		31
Other Comprehensive Income	2,894					2,773		121
Balance at Sep. 30, 2013	$ 1,157,458	$ 0	$ 1,143	$ 1,937,100	$ (680,821)	$ (3,815)	$ (140,018)	$ 43,869