Loans Receivable (Details) (USD $)	6 Months Ended							1 Months Ended		6 Months Ended			1 Months Ended								1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Real Estate Secured	Dec. 31, 2011 Real Estate Secured	Jun. 30, 2012 Other Secured	Dec. 31, 2011 Other Secured	Sep. 30, 2011 Delphis	Dec. 31, 2009 Delphis	Jun. 30, 2012 Delphis	Jun. 30, 2011 Delphis	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	$ 83,282,000		$ 90,148,000			$ 83,282,000	$ 90,148,000
Other	57,258,000		35,643,000	57,258,000	35,643,000
Unamortized discounts, fees and costs	(1,609,000)		(2,128,000)	(521,000)	(1,040,000)	(1,088,000)	(1,088,000)
Allowance for loan losses	(13,410,000)		(13,410,000)			(13,410,000)	(13,410,000)
Loans receivable, net	125,521,000		110,253,000	56,737,000	34,603,000	68,784,000	75,650,000
Provision for loan loss								15,400,000	4,300,000
Distribution of fund to guarantor										1,500,000
Cash payment received										4,900,000
Legal expenses										500,000
Loans receivable, net reported amount										68,800,000		75,700,000
Proceeds from repayment	4,508,000	303,720,000								6,900,000	1,200,000						330,400,000
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
Debt instrument, variable rate basis														one-month London Interbank Offered Rate ("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