CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $)	Total	Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total Stock-holders' Equity	Non-Controlling Interests	Stockholders' Equity, Total
Balance at Dec. 31, 2012	$ 1,548,159,000			$ 1,653,900,000	$ (3,934,000)	$ (120,072,000)	$ 1,531,694,000	$ 16,465,000	$ 1,548,159,000
Balance, par value at Dec. 31, 2012	1,792,000		1,792,000
Balance, (in shares) at Dec. 31, 2012		828,472	179,167,112
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments to Additional Paid in Capital, Other	(3,035,000)
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			331,000
Preferred Stock, Value, Issued		8,000
Shares Issued (in shares)			2,100,000
Stock Issued During Period, Value, New Issues			21,000	27,522,000			27,543,000		27,543,000
Common stock repurchases (in shares)			27,749,693
Common stock repurchases			(278,000)	(350,244,000)					(350,522,000)
Offering costs, commissions and dealer manager fees				(422,000)			(422,000)		(422,000)
Common stock issued through distribution reinvestment plan (in shares)			489,000
Common stock issued through distribution reinvestment plan	4,895,000		5,000	4,890,000			4,895,000		4,895,000
Amortization of restricted shares				2,640,000			2,640,000		2,640,000
Distributions Declared						(32,492,000)	(32,492,000)		(32,492,000)
Issuance of operating partnership units								108,247,000	108,247,000
Proceeds from Contributions from Affiliates	(3,035,000)							750,000	750,000
Distributions to non-controlling interest holders								(921,000)	(921,000)
Net loss	(138,352,000)					(137,920,000)	(137,920,000)	(432,000)	(138,352,000)
Other Comprehensive Income					(1,084,000)		(1,084,000)		(1,084,000)
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition			3,000	612,000			615,000		615,000
Balance at Mar. 31, 2013	1,166,021,000			1,335,863,000	(5,018,000)	(290,484,000)	1,041,912,000	124,109,000	1,166,021,000
Balance, par value at Mar. 31, 2013	$ 1,543,000		$ 1,543,000
Balance, (in shares) at Mar. 31, 2013		828,472	154,322,183