Loans Receivable (Details)	12 Months Ended							0 Months Ended						3 Months Ended						0 Months Ended		1 Months Ended	12 Months Ended			1 Months Ended		0 Months Ended	1 Months Ended				3 Months Ended		0 Months Ended	1 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2013 Real Estate Secured USD ($)	Dec. 31, 2012 Real Estate Secured USD ($)	Dec. 31, 2013 Other Secured USD ($)	Dec. 31, 2012 Other Secured USD ($)	Sep. 06, 2013 Barchester Loan USD ($)	Sep. 06, 2013 Barchester Loan GBP (£)	Aug. 23, 2013 Barchester Loan USD ($)	Aug. 23, 2013 Barchester Loan GBP (£)	May 02, 2013 Barchester Loan USD ($) item	May 02, 2013 Barchester Loan GBP (£)	Sep. 30, 2013 Barchester Loan USD ($)	Sep. 30, 2013 Barchester Loan GBP (£)	Dec. 31, 2013 Tandem Health Care Loan USD ($)	Jul. 31, 2012 Tandem Health Care Loan USD ($)	Jul. 31, 2012 Tandem Health Care Loan Maximum USD ($)	Jul. 31, 2012 Tandem Health Care Loan - First Tranche USD ($)	Jul. 31, 2012 Tandem Health Care Loan - First Tranche Maximum	Jun. 30, 2013 Tandem Health Care Loan - Second Tranche USD ($)	Mar. 31, 2012 Delphis USD ($)	Dec. 31, 2013 Delphis USD ($) item	Dec. 31, 2012 Delphis USD ($) item	Dec. 31, 2011 Delphis USD ($)	Apr. 30, 2011 HCR ManorCare USD ($)	Dec. 31, 2007 HCR ManorCare, mezzanine loan USD ($)	Jan. 31, 2011 HCR ManorCare, participation in first mortgage debt	Jan. 31, 2011 HCR ManorCare, participation in first mortgage debt USD ($)	Aug. 31, 2009 HCR ManorCare, participation in first mortgage debt USD ($)	Apr. 30, 2011 Genesis HealthCare Loans USD ($)	Sep. 30, 2010 Genesis Senior Loans USD ($)	Sep. 30, 2010 Genesis Senior Loans Minimum	Sep. 30, 2010 Genesis Senior Loans Maximum	Oct. 31, 2010 Genesis Mezzanine participation loan USD ($)	Oct. 31, 2010 Genesis Mezzanine participation loan USD ($)
Loans receivable:
Mezzanine	$ 234,455,000	$ 145,150,000				$ 234,455,000	$ 145,150,000
Loan receivable, other	147,669,000	147,264,000		147,669,000	147,264,000													205,000,000	100,000,000		102,000,000				91,000,000
Unamortized discounts, fees and costs	(2,713,000)	(2,974,000)				(2,713,000)	(2,974,000)
Allowance for loan losses	(13,410,000)	(13,410,000)				(13,410,000)	(13,410,000)																(13,000,000)
Loans receivable, net	366,001,000	276,030,000		147,669,000	147,264,000	218,332,000	128,766,000
Loans receivable purchased, face or par value										14,000,000	9,000,000	188,000,000	121,000,000																360,000,000	720,000,000		278,000,000				50,000,000
Loans receivable purchased, discount										8,000,000	5,000,000	170,000,000	109,000,000														100,000,000			130,000,000		28,000,000				10,000,000
Number of facilities												160	160
Debt instrument, variable rate basis												London Interbank Offered Rate ("LIBOR")	London Interbank Offered Rate ("LIBOR")														LIBOR		LIBOR	LIBOR		LIBOR				LIBOR
Debt instrument, weighted-average basis spread on variable rate (as a percent)												3.14%	3.14%														4.00%	1.25%		1.25%			4.75%	5.75%	7.50%
Loan receivable subordinated to senior mortgage debt																443,000,000	400,000,000
Loan receivable subordinated to other senior mezzanine debt																	137,000,000
Loan receivable, interest rate payable (as a percent)																			12.00%		14.00%
Loan receivable term																				63 months
Number of partnerships that lease a property owned by the Company																							1
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
Cash payments received from borrower								202,000,000	129,000,000					202,000,000	129,000,000								12,600,000	43,000,000	2,100,000						330,400,000
Loans receivable, net reported amount																							18,100,000	30,700,000	76,000,000
Proceeds from sale of collateral asset																								38,100,000
Number of collateral primary assets sold																								2
Additional interest income as a result of extinguishment of loans	86,159,000	24,536,000	99,864,000					24,000,000						24,000,000												23,000,000					34,800,000
Loan receivable purchased, acquisition cost																											900,000,000
Amount of loans settled																										2,000,000,000
Debt instrument, variable rate floor (as a percent)																																	1.50%	2.50%
Termination fee																																			$ 2,300,000	$ 2,300,000