Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Assets, Current [Abstract]
Real estate accumulated depreciation	$ 13,032	$ 7,412
Investments in joint ventures at fair value	$ 74,183	$ 68,363
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	81,389,879	64,789,646
Common stock, shares outstanding	81,389,879	63,772,598
Treasury stock par value at cost		$ 0.0001
Treasury stock, shares		1,017,048
Cumulative Preferred Stock Subject to Mandatory Redemption [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
Cumulative preferred stock subject to mandatory redemption Series A [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, dividend rate, percentage	6.00%	6.00%
Preferred stock, shares issued	100,000	100,000
Preferred stock, shares outstanding	100,000	100,000
Mandatory redemption date	May 19, 2015
Cumulative preferred stock subject to mandatory redemption Series B [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, dividend rate, percentage	6.45%	6.45%
Preferred stock, shares issued	32,550	32,550
Preferred stock, shares outstanding	32,550	32,550
Mandatory redemption date	Nov. 03, 2018