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Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Operating Segments
Number of Reportable Operating Segments \| segment			2
Revenue Recognition [Abstract]
Straight Line Rent			$ 3,700
Straight line rent write off			200	$ 36,900
Concentrations of Risk [Abstract]
Operating Lease, Lease Income	$ 123,040	$ 55,591	341,537	288,165
Share-based Payment Arrangement, Noncash Expense [Abstract]
Deferred Costs	32,200		32,200		$ 35,600
Recovery of Direct Costs			11,200	8,900
Rent Abatements			9,100
Deferred Rent Receivables, Net	39,200		39,200
Loans and Leases Receivable, Deferred Income	$ 1,700		$ 1,700
number of theatres in entertainment districts \| segment			7
Mortgage and other participating interest income			$ 0	0
Variable percentage rent			11,300
Rental revenue reduction from straight line				25,400
Collections, Deferred Rent, Cash Basis Tenants			6,000
Collections, Deferred Rent, Accrual Basis Tenants			53,500
Common Stock, Dividends, Per Share, Declared \| $ / shares	$ 0.75
Change in expected credit loss			19,700
Operating Lease, Percentage Revenue			$ 7,200	5,500
London Interbank Offered Rate (LIBOR)
Share-based Payment Arrangement, Noncash Expense [Abstract]
Number of agreements	10		10
London Interbank Offered Rate (LIBOR) \| Short-term Debt
Share-based Payment Arrangement, Noncash Expense [Abstract]
Number of agreements	3		3
TopGolf [Member]
Concentrations of Risk [Abstract]
Operating Lease, Lease Income			$ 63,445	$ 60,330
Percentage of lease revenue in total revenue			16.80%	18.80%
American Multi-Cinema, Inc. [Member]
Concentrations of Risk [Abstract]
Operating Lease, Lease Income			$ 71,000	$ 26,226
Percentage of lease revenue in total revenue			18.80%	8.20%
Restricted Share Units [Member] \| Non-Employee Trustees [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation expense related to employees and trustees			$ 1,700	$ 1,600
Performance Shares [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation, future vesting period minimum (in years)			3 years
Share based compensation expense related to employees and trustees			$ 2,900	700
Restricted Stock [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation expense related to employees and trustees			$ 6,600	8,000
Restricted Stock [Member] \| Minimum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation, future vesting period minimum (in years)			3 years
Restricted Stock [Member] \| Maximum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation, future vesting period minimum (in years)			4 years
Share Options [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Share based compensation, future vesting period minimum (in years)			4 years
Stock-option expense			$ 13	9
Revolving Credit Facility [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Deferred Costs	$ 1,700		1,700		$ 4,800
triple-net lessor costs [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Recovery of Direct Costs			$ 2,800	1,400
straight-line receivable [Member]
Revenue Recognition [Abstract]
Straight line rent write off		20,400		25,400
Ground Lease Straight Line Receivable [Member]
Revenue Recognition [Abstract]
Straight line rent write off		$ 3,500		$ 11,500
Building [Member] \| Minimum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life			30 years
Building [Member] \| Maximum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life			40 years
Furniture, fixtures & equipment [Member] \| Minimum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life			3 years
Furniture, fixtures & equipment [Member] \| Maximum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life			25 years
Building Improvements [Member] \| Minimum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life			10 years
Building Improvements [Member] \| Maximum [Member]
Share-based Payment Arrangement, Noncash Expense [Abstract]
Property, Plant and Equipment, Useful Life			20 years