Property And Equipment (Narrative) (Details)	1 Months Ended				3 Months Ended		9 Months Ended
	Jun. 30, 2024 USD ($)	May 31, 2024 USD ($) a	Jun. 30, 2023 USD ($) ft²	May 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Feb. 23, 2024 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation expense for operating property					$ 3,900,000	$ 4,500,000	$ 11,900,000	$ 13,800,000
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
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
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		$ 19,500,000
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	$ 16,500,000
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	1,500,000
Property book value adjustment	$ 0