Condensed Consolidated Statements of Equity (Unaudited) (USD $) In Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Loss on Derivative Instruments	Distributions in Excess of Net Income	Stockholders' Investment	Nonredeemable Noncontrolling Interests
Beginning balance at Dec. 31, 2009	$ 820,259	$ 169,602	$ 103,352	$ 662,216	$ (86,840)	$ (9,517)	$ (51,402)	$ 787,411	$ 32,848
Net income (loss)	(2,574)						(3,714)	(3,714)	1,140
Other comprehensive income	141					141		141
Total comprehensive income (loss)	(2,433)					141	(3,714)	(3,573)	1,140
Common stock issued pursuant to:
Stock dividend, net of issuance costs	(60)		1,686	10,284			(12,030)	(60)
Grants under director stock grants	250		35	215				250
Restricted stock grants, net of amounts withheld for income taxes			264	(264)
Amortization of stock options and restricted stock, net of forfeitures	1,212			1,212				1,212
Change in fair value of redeemable noncontrolling interests	1,144						1,144	1,144
Distributions to noncontrolling interests	(1,186)								(1,186)
Cash preferred dividends paid	(6,454)						(6,454)	(6,454)
Cash common dividends paid	(6,031)						(6,031)	(6,031)
Ending balance at Jun. 30, 2010	806,701	169,602	105,337	673,663	(86,840)	(9,376)	(78,487)	773,899	32,802
Beginning balance at Dec. 31, 2010	792,851	169,602	106,962	684,551	(86,840)	0	(114,196)	760,079	32,772
Net income (loss)	(4,876)						(6,109)	(6,109)	1,233
Total comprehensive income (loss)	(4,876)						(6,109)	(6,109)	1,233
Common stock issued pursuant to:
Grants under director stock grants	707		82	625				707
Restricted stock grants, net of amounts withheld for income taxes	(3)		244	(247)				(3)
Stock issuance costs	(16)			(16)				(16)
Amortization of stock options and restricted stock, net of forfeitures	1,186		(4)	1,190				1,186
Change in fair value of redeemable noncontrolling interests	(526)			(526)				(526)
Distributions to noncontrolling interests	(1,126)								(1,126)
Cash preferred dividends paid	(6,454)						(6,454)	(6,454)
Cash common dividends paid	(9,316)						(9,316)	(9,316)
Ending balance at Jun. 30, 2011	$ 772,427	$ 169,602	$ 107,284	$ 685,577	$ (86,840)	$ 0	$ (136,075)	$ 739,548	$ 32,879