Real Estate (Rental Income) (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) Tenant	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Lease Income [Abstract]
Rental income from operating leases	$ 184,311,000	$ 173,583,000
Earned income from direct financing leases	151,000	158,000
Percentage rent	701,000	104,000
Real estate expense reimbursement from tenants	4,600,000	5,353,000
Total lease income	189,763,000	179,198,000
Rental income accrued during period	(1,206,000)	(8,445,000)
Balance of accrued rental income	30,727,000		$ 31,942,000
Allowances	$ 4,351,000		4,587,000
Number of tenants | Tenant	2
Straight-line accrued rent from rent deferral repayments	$ (1,780,000)	$ (9,381,000)
Accrued rental income	30,727,000		31,942,000
Accrued rental income allowance	$ 4,351,000		$ 4,587,000