Real Estate (Rental Income) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Lease Income [Abstract]
Rental income from operating leases	$ 197,629,000	$ 185,791,000	$ 395,812,000	$ 370,102,000
Earned income from direct financing leases	143,000	150,000	287,000	301,000
Percentage rent	291,000	295,000	1,054,000	996,000
Real estate expense reimbursement from tenants	4,363,000	4,300,000	8,903,000	8,900,000
Rental income	202,426,000	190,536,000	406,056,000	380,299,000
Rental income accrued during period	534,000	1,547,000	1,003,000	2,643,000
Repayments of deferred rent	486,000	4,005,000	2,172,000	8,062,000
Originally rent due					$ 4,722,000	$ 51,723,000
Straight-line accrued rent from rent deferral repayments	$ 10,000	$ 1,729,000	$ 19,000	$ 3,509,000