Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified					3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Reportable Segment [Member]	Dec. 31, 2012 Reportable Segment [Member]
Summary of assets by business segment
Operating properties					$ 611,962	$ 562,822
Loan assets					157,248	239,534
REIT securities					12,220	19,694
Cash and cash equivalents	131,448	97,682	79,526	40,952	131,448	97,682
Restricted cash	15,821	13,250			2,786
Accounts receivable and prepaids					431	336
Deferred financing costs					2,982	3,095
TOTAL ASSETS	919,077	923,163			919,077	923,163
Capital Expenditures
Operating Properties					$ 502	$ 12,417