Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified					6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2012 Reportable Segment [Member]	Dec. 31, 2011 Reportable Segment [Member]
Summary of Assets by Business Segment
Operating Properties					$ 489,803	$ 442,209
Loan assets					191,047	217,174
REIT securities					34,079	28,856
Cash and cash equivalents	43,959	40,952	51,344	45,257	43,959	40,952
Restricted cash	10,678	3,914			4,497	3,914
Accounts receivable and prepaid					1,085	504
Deferred financing costs					244	318
Discontinued operations					6	6
Assets, Total	$ 764,720	$ 733,933			$ 764,720	$ 733,933