Real Estate Investments, Net - Rental Income (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) operator	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Lessor, Lease, Description [Line Items]
Contractual rent due	$ 188,906,000	$ 190,100,000	$ 171,309,000
Straight-line rent	17,000	32,000	77,000
Adjustment for collectibility	(1,417,000)	0	0
Recovery of previously reserved rent	0	0	1,047,000
Lease termination revenue	0	63,000	1,179,000
Total	$ 187,506,000	190,195,000	173,612,000
Number of operators for which collectability not probable | operator	5
Metron
Lessor, Lease, Description [Line Items]
Lease termination revenue		$ 100,000	$ 1,200,000
Lease Income, Operating Expense Reimbursements
Lessor, Lease, Description [Line Items]
Operating lease, lease income, adjustments for collectability, reversed	$ 700,000
Contractual Rent
Lessor, Lease, Description [Line Items]
Operating lease, lease income, adjustments for collectability, reversed	200,000
Straight-line Rent
Lessor, Lease, Description [Line Items]
Operating lease, lease income, adjustments for collectability, reversed	$ 500,000