Real Estate (Rental Income) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) Tenant	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Tenant	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Lease Income [Abstract]
Rental income from operating leases	$ 188,840,000	$ 175,833,000	$ 558,942,000	$ 522,787,000
Earned income from direct financing leases	148,000	154,000	449,000	469,000
Percentage rent	235,000	195,000	1,231,000	530,000
Real estate expense reimbursement from tenants	3,879,000	3,842,000	12,779,000	13,440,000
Total lease income	193,102,000	180,024,000	573,401,000	537,226,000
Rental income accrued during period	$ 655,000,000	3,400,000,000	$ 3,298,000,000	19,091,000,000
Number of tenants | Tenant	3		3
Straight-line accrued rent from rent deferral repayments	$ (1,201,000)	$ (4,294,000)	$ (4,710,000)	$ (21,996,000)
Accrued rental income	28,231,000		28,231,000		$ 31,942,000
Accrued rental income allowance	$ 3,924,000		$ 3,924,000		$ 4,587,000