Loans Receivable (Details) (USD $)										1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Real Estate Secured	Dec. 31, 2012 Real Estate Secured	Mar. 31, 2013 Other Secured	Dec. 31, 2012 Other Secured	Jul. 31, 2012 Tandem Health Care Loan	Jul. 31, 2012 Tandem Health Care Loan First Tranche	Jul. 31, 2012 Tandem Health Care Loan Second Tranche	Jul. 31, 2012 Tandem Health Care Loan Maximum	Mar. 31, 2012 Delphis	Dec. 31, 2012 Delphis item	Mar. 31, 2013 Delphis
Loans receivable:
Mezzanine	$ 145,150,000	$ 145,150,000			$ 145,150,000	$ 145,150,000
Loan receivable, other	163,008,000	147,264,000	163,008,000	147,264,000				100,000,000	105,000,000	205,000,000
Unamortized discounts, fees and costs	(2,878,000)	(2,974,000)			(2,878,000)	(2,974,000)
Allowance for loan losses	(13,410,000)	(13,410,000)			(13,410,000)	(13,410,000)
Loans receivable, net	291,870,000	276,030,000	163,008,000	147,264,000	128,862,000	128,766,000
Loan receivable subordinated to senior mortgage debt							400,000,000
Loan receivable subordinated to senior mezzanine debt							137,000,000
Loan receivable, interest rate payable at maturity (as a percent)								12.00%	14.00%
Loan receivable term										63 months
Distribution of fund to guarantor												1,500,000
Cash payment received											4,800,000
Legal expenses											500,000
Other consideration received											2,100,000
Proceeds from guarantor											6,900,000
Proceeds from sale of collateral asset												38,100,000
Number of collateral primary assets sold												2
Loans receivable, net reported amount												$ 30,700,000	$ 30,700,000