Real Estate (Rental Income) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) Tenant	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) Tenant	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Lease Income [Abstract]
Rental income from operating leases	$ 185,791,000	$ 173,371,000	$ 370,102,000	$ 346,954,000
Earned income from direct financing leases	150,000	157,000	301,000	315,000
Percentage rent	295,000	231,000	996,000	335,000
Real estate expense reimbursement from tenants	4,300,000	4,245,000	8,900,000	9,598,000
Total lease income	190,536,000	178,004,000	380,299,000	357,202,000
Rental income accrued during period	1,547,000,000	7,359,000,000	2,643,000,000	15,692,000,000
Balance of accrued rental income	29,065,000		29,065,000		$ 31,942,000
Allowances	$ 4,090,000		$ 4,090,000		4,587,000
Number of tenants | Tenant	3		3
Straight-line accrued rent from rent deferral repayments	$ (1,729,000)	$ (8,323,000)	$ (3,509,000)	$ (17,706,000)
Accrued rental income	29,065,000		29,065,000		31,942,000
Accrued rental income allowance	$ 4,090,000		$ 4,090,000		$ 4,587,000