Investments - Operating Lease Asset (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) lease	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Operating ground lease assets	$ 32,601,000		$ 32,601,000		$ 33,318,000
Rental revenue	703,000	$ 702,000	1,406,000	$ 1,405,000
Future minimum lease payments
Total operating lease liabilities - ground leases	37,035,000		37,035,000		$ 37,637,000
Ground lease by STORE capital
Future minimum lease payments
Long-term lease commitment	19,000,000.0		$ 19,000,000.0
Ground lease by STORE capital tenants
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of ground lease payments based on level of tenant's sales | lease			3
Ground leases
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Operating ground lease assets	32,600,000		$ 32,600,000
Lease costs	821,000	827,000	1,600,000	1,600,000
Rental revenue	703,000	$ 702,000	1,400,000	$ 1,400,000
Future minimum lease payments
Remainder of 2022	1,769,000		1,769,000
2023	6,778,000		6,778,000
2024	2,766,000		2,766,000
2025	2,452,000		2,452,000
2026	2,290,000		2,290,000
2027	2,284,000		2,284,000
Thereafter	45,296,000		45,296,000
Total lease payments	63,635,000		63,635,000
Less imputed interest	(30,288,000)		(30,288,000)
Total operating lease liabilities - ground leases	33,347,000		33,347,000
Ground leases | Ground lease by STORE capital
Future minimum lease payments
Remainder of 2022	200,000		200,000
2023	4,149,000		4,149,000
2024	55,000		55,000
2025	57,000		57,000
2026	57,000		57,000
2027	57,000		57,000
Thereafter	3,014,000		3,014,000
Total lease payments	7,589,000		7,589,000
Less imputed interest	(2,790,000)		(2,790,000)
Total operating lease liabilities - ground leases	4,799,000		4,799,000
Ground leases | Ground lease by STORE capital tenants
Future minimum lease payments
Remainder of 2022	1,569,000		1,569,000
2023	2,629,000		2,629,000
2024	2,711,000		2,711,000
2025	2,395,000		2,395,000
2026	2,233,000		2,233,000
2027	2,227,000		2,227,000
Thereafter	42,282,000		42,282,000
Total lease payments	56,046,000		56,046,000
Less imputed interest	(27,498,000)		(27,498,000)
Total operating lease liabilities - ground leases	$ 28,548,000		$ 28,548,000