Real Estate Investments - Operator changes (Details)						1 Months Ended	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 01, 2020 USD ($)	Jul. 01, 2019 USD ($) item	Jun. 01, 2019 USD ($)	Dec. 04, 2018	Apr. 12, 2018	Jul. 31, 2019 USD ($) item	Jun. 30, 2019 USD ($) item	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 lease property
Other disclosures
Rent in year two							$ 143,029,000	$ 143,029,000
Rent in year three							133,232,000	133,232,000
Rent in year four							$ 120,952,000	$ 120,952,000
Florida
Other disclosures
Increase in Lease Rent (as a percent)		3.50%
Forecast
Other disclosures
Contractual rent (as a percent)		50.00%
Contractual Rent Deferment Term		5 months
Forecast | Georgia and South Carolina
Other disclosures
Rent on cash basis		$ 1,762,000
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
Initial lease term							10 years	10 years
Rent in year one							$ 1,250,000	$ 1,250,000
Rent in year two							1,500,000	1,500,000
Rent in year three							1,975,000	1,975,000
Rent in year four							$ 2,150,000	2,150,000
Rent on cash basis								$ 700,000
Thrive | Forecast
Other disclosures
Initial lease term		2 years
Master lease in default
Other disclosures
Rent on cash basis			$ 400,000
Master lease in default | Forecast
Other disclosures
Rent on cash basis	$ 300,000
ALF and MC | Thrive | Forecast
Other disclosures
Number of properties in transition | item		2
120 units | MC | Thrive | Ohio and Kentucky
Other disclosures
Number of properties in transition | item							2
Number of units in transition | item							120
56-unit MC | Texas
Other disclosures
Number of properties in transition | item							56
159 units | Forecast | Georgia and South Carolina
Other disclosures
Number of properties in transition | item		159
60-unit MC | Forecast | Florida
Other disclosures
Initial lease term						10 years
Number of properties in transition | item						60
Rent in year two						$ 450,000
Rent in year three						600,000
60-unit MC | Maximum | Forecast | Florida
Other disclosures
Deferred lease payments						$ 150,000
Senior Care Centers
Other disclosures
Petition Date and Reject The Lease Period				120 days	120 days
Petition Date and Reject The Lease Additional Period				90 days	90 days