Real Estate Investments - Operator changes (Details)		3 Months Ended	12 Months Ended
	Dec. 04, 2018 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 lease property
Anthem Memory Care
Other disclosures
Number of properties in default | property				11
Anthem Memory Care | Forecast
Other disclosures
Minimum cash rent received			$ 7,500,000
Percentage of contractual amount due			50.00%
Preferred Care, Inc.
Other disclosures
Number of properties under two master leases | property				24
Number of master leases | lease				2
Thrive
Other disclosures
Rent on cash basis		$ 700,000
Senior Care Centers
Other disclosures
Petition Date and Reject The Lease Period	120 days
Petition Date and Reject The Lease Additional Period	90 days
Letter of credit	$ 2,000,000
Maintenance and repair escrows	2,200,000
Property tax escrows	$ 1,800,000