Consolidated Statements of Shareholders' Equity and Comprehensive Income (Unaudited) (USD $) In Thousands	Series A Preferred Stock [Member]	Series B Preferred Stock [Member]	Common Shares [Member] Class A [Member]	Common Shares [Member] Class B [Member]	Additional Paid-in Capital [Member]	Other Comprehensive Income [Member]	Distributions in Excess of Net Earnings [Member]	Distributions in Excess of Net Earnings [Member] Class A [Member]	Distributions in Excess of Net Earnings [Member] Class B [Member]	Total Shareholders' Equity [Member]	Total Shareholders' Equity [Member] Class A [Member]	Total Shareholders' Equity [Member] Class B [Member]	Noncontrolling Interest [Member]	Noncontrolling Interest [Member] Corporate Joint Venture [Member]	Noncontrolling Interest [Member] Common Units [Member]	Total	Redeemable Noncontrolling Interests [Member] Common Units [Member]
Balance at Dec. 31, 2009	$ 24	$ 0	$ 577	$ 0	$ 487,481	$ (160)	$ (185,725)			$ 302,197			$ 27,393	$ 267	$ 27,126	$ 329,590	$ 14,733
Unit Conversion	0	0	18	0	8,406	0	0			8,424			(8,424)	0	(8,424)	0	0
Units Issued for Acquisitions	0	0	0	0	0	0	0			0			6,256	0	6,256	6,256	0
Common Share Issuance, net of costs	0	0	794	0	259,970	0	0			260,764			0	0	0	260,764	0
Preferred Stock Offering, net of costs																0
Common Stock	0	0	0	0	0	0	(13,824)			(13,824)			0	0	0	(13,824)	0
Preferred Stock	0	0	0	0	0	0	(2,400)			(2,400)			0	0	0	(3,499)	0
Common Units	0	0	0	0	0	0	0			0			(620)	0	(620)	(620)	(307)
Dividend Reinvestment Plan	0	0	0	0	6	0	0			6			0	0	0	6	0
Grants	0	0	3	0	122	0	0			125			0	0	0	0	0
Amortization	0	0	0	0	1,970	0	0			1,970			0	0	0	1,970	0
Other Comprehensive Income (Loss)	0	0	0	0	0	(200)	0			(200)			0	0	0	(200)	0
Net Loss	0	0	0	0	0	0	(10,066)			(10,066)			(304)	233	(537)	(10,630)	(260)
Total Comprehensive Loss										(10,266)			(304)	233	(537)	(10,570)	(260)
Balance at Jun. 30, 2010	24	0	1,392	0	757,955	(360)	(212,015)			546,996			24,301	500	23,801	571,172	14,166
Balance at Dec. 31, 2010	24	0	1,692	0	918,215	(338)	(236,159)			683,434			19,884	474	19,410	703,318	19,894
Unit Conversion	0	0	1	0	477	0	0			478			(707)	0	(707)	(229)	229
Reallocation of Noncontrolling Interest	0	0	0	0	2,593	0	0			2,593			(13)	0	(13)	2,580	(2,578)
Preferred Stock Offering, net of costs	0	46	0	0	111,114	0	0			111,160			0	0	0	111,160	0
Common Stock	0	0	0	0	0	0	(18,680)			(18,680)			0	0	0	(18,680)	0
Preferred Stock	0		0		0	0		(2,400)	(1,099)		(2,400)	(1,099)	0	0	0	(2,400)	0
Common Units	0	0	0	0	0	0	0			0			(468)	0	(468)	(468)	(335)
Contribution by Noncontrolling Interests in consolidated joint venture	0	0	0	0	0	0	0			0			342	342	0	342	0
Deconsolidation of consolidated joint venture	0	0	0	0	0	0	0			0			(322)	(322)		(322)	0
Dividend Reinvestment Plan	0	0	0	0	7	0	0			7			0	0	0	7	0
Grants	0	0	6	0	1,471	0	0			1,477			0	0	0	1,477	0
Amortization	0	0	0	0	2,973	0	0			2,973			0	0	0	2,973	0
Other Comprehensive Income (Loss)	0	0	0	0	0	(292)	0			(292)			0	0	0	(292)	0
Net Loss	0	0	0	0	0	0	(4,452)			(4,452)			(476)	(272)	(204)	(5,070)	(142)
Total Comprehensive Loss										(4,744)			(476)	(272)	(204)	(5,220)	(142)
Balance at Jun. 30, 2011	$ 24	$ 46	$ 1,699	$ 0	$ 1,036,850	$ (630)	$ (262,790)			$ 775,199			$ 18,240	$ 222	$ 18,018	$ 793,439	$ 17,068