CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $)	Total	Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total Stock-holders' Equity	Non-Controlling Interests	Stockholders' Equity, Total
Balance, par value at Dec. 31, 2012	$ 1,792,000		$ 1,792,000
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	8,000	8,000
Balance, (in shares) at Dec. 31, 2012		828,472	179,167,112
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock (in shares)			32,035,064
Issuance of common stock			320,000	490,264,000			490,584,000	(5,800,000)	490,584,000
Stock Issued During Period, Shares, Conversion of Units			599,233
Stock Issued During Period, Value, OP Units Converted to Shares			6,000	5,794,000
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
Common stock repurchases (in shares)			(27,739,523)
Common stock repurchases			(277,000)	(350,119,000)			(350,396,000)		(350,396,000)
Offering costs, commissions and dealer manager fees				(3,260,000)			(3,260,000)		(3,260,000)
Equity-based compensation (in shares)			343,000
Equity-based compensation			0	0			0	3,682,000	3,682,000
Amortization of restricted shares				3,026,000			3,026,000		3,026,000
Consideration paid for assets of Manager in excess of carryover basis				(3,035,000)			(3,035,000)		(3,035,000)
Distributions Declared						(69,817,000)	(69,817,000)		(69,817,000)
Issuance of operating partnership units								108,247,000	108,247,000
Contributions from non-controlling interest holders	0							750,000	750,000
Distributions to non-controlling interest holders								(3,111,000)	(3,111,000)
Net loss	(190,365,000)							(752,000)	(190,365,000)
Net Income (Loss) Attributable to Parent	(189,613,000)					(189,613,000)	(189,613,000)
Other comprehensive income					12,853,000		12,853,000		12,853,000
Balance, par value at Jun. 30, 2013	1,846,000		1,846,000
Balance at Jun. 30, 2013	1,552,212,000			1,801,460,000	8,919,000	(379,502,000)	1,432,731,000	119,481,000	1,552,212,000
Balance, par value at Jun. 30, 2013	$ 8,000	$ 8,000
Balance, (in shares) at Jun. 30, 2013		828,472	184,893,886