CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Total	Common Shares [Member] Class A [Member]	Common Shares [Member] Class B [Member]	Preferred Shares [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Distributions in Excess of Net Earnings [Member]	Total Shareholders' Equity [Member]	Noncontrolling Interests Common Units [Member]	Noncontrolling Interests Consolidated Joint Ventures [Member]	Noncontrolling Interests Consolidated Variable Interest Entity [Member]	Noncontrolling Interests [Member]	Redeemable Noncontrolling Interests Common Units [Member]
Balance, redeemable noncontrolling interests at Dec. 31, 2011													$ 14,955
Balance at Dec. 31, 2011	747,842	1,699	0	70	1,041,027	(1,151)	(310,974)	730,671	16,864	307	0	17,171
Unit Conversion	(3)	0	0	0	31	0	0	31	(34)	0	0	(34)	0
Reclassification/Reallocation of Noncontrolling Interest	(2,152)	0	0	0	(2,152)	0	0	(2,152)	0	0	0	0	2,152
Common Stock Option Cancellation		25	0	0	(25)	0		0	0	0	0	0
Dividends and Distributions declared:
Common Stock ($0.06 and $0.06 per share)	(10,398)	0	0	0	0	0	(10,398)	(10,398)	0	0	0	0	0
Preferred Stock	(3,500)	0	0	0	0	0	(3,500)	(3,500)	0	0	0	0	0
Common Units ($0.06 and $0.06 per share)	(252)	0			0	0	0	0	(252)	0	0	(252)	(184)
Dividend Reinvestment Plan	5	1	0	0	4	0	0	5	0	0	0	0	0
Stock Based Compensation
Grants	2,302	8	0	0	2,294	0	0	2,302	0	0	0	0	0
Amortization	1,288	0	0	0	1,288	0	0	1,288	0	0	0	0	0
Change in Fair Value of Derivative Instruments	27	0	0	0	0	27	0	27	0	0	0	0	0
Net Income (Loss)	(7,723)	0	0	0	0	0	(7,173)	(7,173)	(263)	(287)	0	(550)	(191)
Balance, redeemable noncontrolling interests at Mar. 31, 2012													16,732
Balance at Mar. 31, 2012	727,436	1,733	0	70	1,042,467	(1,124)	(332,045)	711,101	16,315	20	0	16,335
Balance, redeemable noncontrolling interests at Dec. 31, 2012	15,321												15,321
Balance at Dec. 31, 2012	845,788	1,986	0	70	1,178,292	(1,786)	(348,734)	829,828	15,484	0	476	15,960
Unit Conversion	0	1	0	0	69	0	0	70	(70)	0	0	(70)	0
Reclassification/Reallocation of Noncontrolling Interest	15,251	0	0	0	0	0	0	0	15,251	0	0	15,251	(15,251)
Preferred Stock
Preferred Stock Offering, net of costs	72,419	0	0	30	72,389	0	0	72,419	0	0	0	0	0
Preferred Stock Redemption	(60,000)	0	0	(24)	(59,976)	0	0	(60,000)	0	0	0	0	0
Dividends and Distributions declared:
Common Stock ($0.06 and $0.06 per share)	(13,250)	0	0	0	0	0	(13,250)	(13,250)	0	0	0	0	0
Preferred Stock	(3,844)	0	0	0	0	0	(3,844)	(3,844)	0	0	0	0	0
Common Units ($0.06 and $0.06 per share)	(426)	0	0	0	0	0	0	0	(426)	0	0	(426)	0
Dividend Reinvestment Plan	10	0	0	0	10	0	0	10	0	0	0	0	0
Stock Based Compensation
Grants	0	39	0	0	(39)	0	0	0	0	0	0	0	0
Amortization	4,094	0	0	0	4,094	0	0	4,094	0	0	0	0	0
Change in Fair Value of Derivative Instruments	156	0	0	0	0	156	0	156	0	0	0	0	0
Net Income (Loss)	(7,606)	0	0	0	0	0	(7,003)	(7,003)	(402)	0	(201)	(603)	(70)
Balance, redeemable noncontrolling interests at Mar. 31, 2013	0												0
Balance at Mar. 31, 2013	$ 852,592	$ 2,026	$ 0	$ 76	$ 1,194,839	$ (1,630)	$ (372,831)	$ 822,480	$ 29,837	$ 0	$ 275	$ 30,112