Real Estate (Rental Income) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Real Estate [Abstract]
Rental income from operating leases	$ 703,865,000	$ 639,265,000	$ 650,112,000
Earned income from direct financing leases	623,000	647,000	798,000
Percentage rent	706,000	842,000	1,310,000
Real estate expense reimbursement from tenants	18,665,000	18,039,000	16,789,000
Rental income	723,859,000	658,793,000	669,009,000
Rental income accrued during period	(21,588,000)	25,449,000	$ 1,872,000
Write-off of accrued rental income		16,367,000
Balance of accrued rental income	31,942,000	53,958,000
Allowances	$ 4,587,000	$ 6,947,000