Loans Receivable - Other Secured Loans (Details) $ in Thousands	1 Months Ended								3 Months Ended	6 Months Ended			12 Months Ended
	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 GBP (£) property	Apr. 30, 2015 GBP (£) property	Feb. 28, 2015 GBP (£)	Feb. 28, 2015 USD ($)	Nov. 30, 2014 GBP (£) property item	Nov. 30, 2014 USD ($) property item	Mar. 31, 2016 property	Jun. 30, 2016 USD ($)	Jun. 30, 2015 GBP (£)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	May 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Jun. 30, 2013 USD ($)	Jul. 31, 2012 USD ($)	Jun. 30, 2012 GBP (£)
Loans Receivable:
Senior secured term loan										$ 688,910					$ 932,212
Loans receivable, other										78,889					114,322
Amount draw on the revolving line of credit facility										642,898		$ 186,557
Loan amount outstanding										869,078					$ 397,432
NHP[Member]
Loans Receivable:
Number of facilities | property							273	273
Number of beds acquired | item							12,500	12,500
Four Seasons Health Care
Loans Receivable:
Senior secured term loan | £	£ 40,000,000												£ 40,000,000
HC-One Facility
Loans Receivable:
Number of facilities | property				36
Loan facility maximum					£ 502,000,000		£ 395,000,000										$ 795,000
Amount draw on the revolving line of credit facility							£ 363,000,000	$ 574,000
Term of facility							5 years	5 years
Increase in loan facility			£ 11,000,000		£ 108,000,000	$ 164,000
Amount of facility converted into sale-leaseback transaction				£ 174,000,000							£ 174,000,000	$ 254,000
Paydowns received | £			£ 34,000,000
Non-call period shortened			17 months
Number of properties spinoff into a separate joint venture | property			36						36
Term to retain security over the spinoff properties			2 years
Cash payments received from borrower													£ 34,000,000	$ 52,000
Loan amount outstanding										372,000
Tandem Health Care Loan
Loans Receivable:
Loan facility maximum																			$ 205,000
Loans receivable, other										$ 256,000
Loan receivable, interest rate payable (as a percent)										11.50%
Loan receivable subordinated to senior mortgage debt										$ 379,000
Tandem Health Care Loan - First Tranche
Loans Receivable:
Loans receivable, other																			$ 100,000
Loan receivable, interest rate payable (as a percent)										12.00%
Tandem Health Care Loan - Second Tranche
Loans Receivable:
Loans receivable, other																		$ 102,000
Loan receivable, interest rate payable (as a percent)										14.00%
Tandem Health Care Loan Third Tranche [Member]
Loans Receivable:
Loans receivable, other																$ 50,000
Loan receivable, interest rate payable (as a percent)										6.00%
Tandem Health Care Loan Fourth Tranche [Member]
Loans Receivable:
Loans receivable, other																$ 5,000
Loan receivable, interest rate payable (as a percent)										6.00%
Four Seasons
Loans Receivable:
Payment to purchase senior secured term loan	£ 28,000,000	$ 42,000
Marketable debt security, par value | £																				£ 138,500,000
Four Seasons | LIBOR
Loans Receivable:
Loan, basis spread on variable rate	6.00%	6.00%