Loans Receivable (Details) (USD $)	12 Months Ended		12 Months Ended							1 Months Ended	12 Months Ended		1 Months Ended								1 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2012 Real Estate Secured	Dec. 31, 2011 Real Estate Secured	Dec. 31, 2012 Other Secured	Dec. 31, 2011 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	Dec. 31, 2012 Delphis item	Dec. 31, 2011 Delphis	Apr. 30, 2011 HCR ManorCare	Dec. 31, 2007 HCR ManorCare, mezzanine loan	Jan. 31, 2011 HCR ManorCare, participation in first mortgage debt	Aug. 31, 2009 HCR ManorCare, participation in first mortgage debt	Apr. 30, 2011 Genesis HealthCare Loans	Sep. 30, 2010 Genesis Senior Loans	Sep. 30, 2010 Genesis Senior Loans Minimum	Sep. 30, 2010 Genesis Senior Loans Maximum	Oct. 31, 2010 Genesis Mezzanine participation loan
Loans receivable:
Mezzanine	$ 90,148,000	$ 145,150,000			$ 145,150,000	$ 90,148,000
Loan receivable	35,643,000	147,264,000	147,264,000	35,643,000				100,000,000	105,000,000	205,000,000
Unamortized discounts, fees and costs	(2,128,000)	(2,974,000)		(1,040,000)	(2,974,000)	(1,088,000)
Interest income related to loans			6,000,000
Accrued interest receivables related to loans			3,000,000
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	2,100,000
Proceeds from repayment											43,000,000						330,400,000
Loans receivable, net reported amount											30,700,000	75,700,000
Proceeds from sale of collateral asset											38,100,000
Number of collateral primary assets sold											2
Reconciliation of beginning and ending allowance for loan losses
Balance at the beginning of the period	3,397,000	13,410,000			13,410,000	13,410,000
Additions	10,013,000
Balance at the end of the period	13,410,000	13,410,000			13,410,000	13,410,000
Additions related to accrued interest receivable	5,400,000	5,400,000
Loans receivable, net	110,253,000	276,030,000	147,264,000	34,603,000	128,766,000	75,650,000
Loans receivable purchased, face or par value															360,000,000	720,000,000		278,000,000			50,000,000
Loan receivable purchased, acquisition cost														900,000,000
Loans receivable purchased, discount														100,000,000		130,000,000		28,000,000			10,000,000
Amount of loans settled													2,000,000,000
Debt instrument, variable rate basis														one-month London Interbank Offered Rate ("LIBOR")	LIBOR	LIBOR		LIBOR			LIBOR
Debt instrument, variable rate floor (as a percent)																			1.50%	2.50%
Debt instrument, basis spread on variable rate (as a percent)														4.00%	1.25%				4.75%	5.75%	7.50%
Additional interest income as a result of extinguishment of loans													23,000,000				34,800,000
Termination fee																					$ 2,300,000