Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Accumulated Distributions in excess of Net Loss	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balance, value at Dec. 31, 2011	$ 4,663,314	$ 869	$ 7,775,880	$ (3,155,222)	$ 41,948	$ (161)
Balance, shares at Dec. 31, 2011		869,187,360
Net income (loss)	(30,210)			(30,283)		73
Unrealized gain/loss on investment securities	18,331				18,331
Unrealized loss on derivatives	(477)				(477)
Reclassification Adjustment from AOCI on Derivatives and Securities	(798)				(798)
Contributions/(distributions) declared, net	(109,383)			(109,217)		(166)
Proceeds from distribution reinvestment plan, value	49,176	7	49,169
Proceeds from distribution reinvestment plan, shares		6,811,250
Balance, value at Mar. 31, 2012	4,589,953	876	7,825,049	(3,294,722)	59,004	(254)
Balance, shares at Mar. 31, 2012		875,998,610
Balance, value at Dec. 31, 2012	4,342,750	889	7,921,913	(3,664,591)	84,414	125
Balance, shares at Dec. 31, 2012		889,424,572
Net income (loss)	4,491			4,483		8
Unrealized gain/loss on investment securities	47,393				47,393
Unrealized loss on derivatives	(4)				(4)
Reclassification Adjustment from AOCI on Derivatives and Securities	(1,083)				(1,083)
Contributions/(distributions) declared, net	(111,577)			(111,569)		(8)
Proceeds from distribution reinvestment plan, value	46,007	7	46,000
Proceeds from distribution reinvestment plan, shares		6,644,897
Share repurchase program, value	(9,250)	(2)	(9,248)
Share repurchase program, shares		(1,334,524)
Balance, value at Mar. 31, 2013	$ 4,318,727	$ 894	$ 7,958,665	$ (3,771,677)	$ 130,720	$ 125
Balance, shares at Mar. 31, 2013		894,734,945