Real Estate Investments - Mortgage Loans Activity (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($) item
Mortgage Loans
Originations and fundings under mortgage loans receivable	$ 9,736	$ 11,654
Pay-offs received		(1,086)
Scheduled principal payments received	(565)	(550)
Mortgage loan (premiums)	(2)	(2)
(Provision for)/ recovery of loan loss reserve	(92)	(100)
Net increase in mortgage loans receivable	$ 9,077	9,916
Mortgage Loans
Mortgage Loans
Loan Term	30 years
Specified basis points for annual increase in interest rate (as a percent)	2.25%
Mortgages with 9.41% Interest, fixed for two years, and escalating by 2.25% thereafter
Mortgage Loans
Loan Term	2 years
Mortgages with 9.41% Interest, fixed for two years, and escalating by 2.25% thereafter | Mortgage Loans
Mortgage Loans
Additions to mortgage loans	$ 7,500
Interest rate (as a percent)	9.41%
Specified basis points for annual increase in interest rate (as a percent)	2.25%
Michigan | SNF | Mortgages with 8.7% Interest, fixed for five years, and escalating by 2.25% thereafter | Mortgage Loans
Mortgage Loans
Additions to mortgage loans		$ 7,400
Interest rate (as a percent)		8.70%
Loan Term	5 years
Specified basis points for annual increase in interest rate (as a percent)		2.25%
SNF Beds | Mortgage Loans
Mortgage Loans
Number of beds/units | item	2,892
SNF Beds | Michigan | SNF | Mortgages with 8.7% Interest, fixed for five years, and escalating by 2.25% thereafter | Mortgage Loans
Mortgage Loans
Number of beds/units | item		112