Property And Equipment (Narrative) (Details)	1 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	May 31, 2024 USD ($) a	Jun. 30, 2023 USD ($) ft²	May 31, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($) ft²	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($) ft²	Feb. 23, 2024 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation expense for operating property					$ 4,000,000.0	$ 4,700,000	$ 8,100,000	$ 9,300,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 2483 Trenton Avenue Williamsport Pennsylvania [Member]
Property, Plant and Equipment [Line Items]
Book value			$ 460,000			$ 460,000		$ 460,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 2483 Trenton Avenue Williamsport Pennsylvania [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Area of Land | ft²			18,000			18,000		18,000
Property book value adjustment			$ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Culver City Los Angeles [Member]
Property, Plant and Equipment [Line Items]
Sale price				$ 8,300,000					$ 10,000,000.0
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Culver City Los Angeles [Member]
Property, Plant and Equipment [Line Items]
Adjustment to sale price				0
Book value				$ 10,800,000
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Cannon Park ETC [Member]
Property, Plant and Equipment [Line Items]
Book value		$ 18,800,000
Area of Land | a		9.4
Property book value adjustment		$ 0
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Courtenay Central ETC [Member]
Property, Plant and Equipment [Line Items]
Book value	$ 15,800,000				15,800,000		15,800,000
Property book value adjustment	0
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Rotorua Cinema Building [Member]
Property, Plant and Equipment [Line Items]
Book value	1,400,000				$ 1,400,000		$ 1,400,000
Property book value adjustment	$ 0