Borrowings (Summary Of Borrowings) (Details) $ in Thousands, $ in Millions				3 Months Ended		12 Months Ended
	Mar. 27, 2024	Jan. 26, 2024	Sep. 18, 2019	Mar. 31, 2024 USD ($)	Mar. 31, 2024 NZD ($)	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Contractual Facility				$ 203,510		$ 218,159
Balance Gross				195,651		210,300
Balance Net				194,544		208,847
Deferred financing costs, net				$ 1,100		$ 1,500
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Maturity Date				Apr. 30, 2027	Apr. 30, 2027	Apr. 30, 2027
Contractual Facility				$ 27,913		$ 27,913
Balance Gross				27,913		27,913
Balance Net				$ 27,228		$ 27,172
Stated Interest Rate				9.58%	9.58%	9.65%
Effective Interest Rate				9.58%		9.65%
Bank Of America Credit Facility [Member]
Debt Instrument [Line Items]
Maturity Date	Aug. 18, 2025			Aug. 18, 2025	Aug. 18, 2025	Sep. 04, 2024
Contractual Facility				$ 17,750		$ 20,200
Balance Gross				17,750		20,200
Balance Net				$ 17,665		$ 20,080
Stated Interest Rate				11.50%	11.50%	11.00%
Effective Interest Rate				11.50%		11.00%
US Cinema 1, 2, 3 Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date				Oct. 01, 2024	Oct. 01, 2024	Oct. 01, 2024
Contractual Facility				$ 20,928		$ 21,008
Balance Gross				20,928		21,008
Balance Net				$ 20,739		$ 20,780
Stated Interest Rate				8.83%	8.83%	8.84%
Effective Interest Rate				8.83%		8.84%
Minetta And Orpheum Theatres Loan [Member]
Debt Instrument [Line Items]
Maturity Date		Jun. 01, 2024		Jun. 01, 2024	Jun. 01, 2024	Jun. 01, 2024
Contractual Facility				$ 8,000		$ 8,000
Balance Gross				8,000		8,000
Balance Net				$ 7,984		$ 8,000
Stated Interest Rate				7.00%	7.00%	8.34%
Effective Interest Rate				7.00%		8.34%
U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date						Jan. 01, 2027
Contractual Facility				$ 8,400		$ 8,401
Balance Gross						8,401
Balance Net						$ 8,356
Union Square Construction Financing [Member]
Debt Instrument [Line Items]
Maturity Date				May 06, 2024	May 06, 2024	May 06, 2024
Contractual Facility				$ 55,000		$ 55,000
Balance Gross				47,141		47,141
Balance Net				$ 47,087		$ 46,925
Stated Interest Rate				12.52%	12.52%	12.53%
Effective Interest Rate				12.52%		12.53%
Purchase Money Promissory Note [Member]
Debt Instrument [Line Items]
Maturity Date			Sep. 18, 2024	Sep. 18, 2024	Sep. 18, 2024	Sep. 18, 2024
Contractual Facility				$ 393		$ 586
Balance Gross				393		586
Balance Net				$ 393		$ 586
Stated Interest Rate				5.00%	5.00%	5.00%
Effective Interest Rate				5.00%		5.00%
NAB Australian Corporate Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date				Jul. 31, 2025	Jul. 31, 2025	Jul. 31, 2025
Contractual Facility				$ 65,240		$ 68,276
Balance Gross				65,240		68,276
Balance Net				$ 65,162		$ 68,173
Stated Interest Rate				6.10%	6.10%	6.11%
Effective Interest Rate				6.10%		6.11%
NAB Corporate Loan Facility [Member]
Debt Instrument [Line Items]
Balance Net				$ 65,200
Westpac Bank Corporate Credit Facility [Member]
Debt Instrument [Line Items]
Maturity Date				Jan. 01, 2025	Jan. 01, 2025	Jan. 01, 2025
Contractual Facility				$ 8,286	$ 13.8	$ 8,775
Balance Gross				8,286		8,775
Balance Net				$ 8,286		$ 8,775
Stated Interest Rate				8.20%	8.20%	8.20%
Effective Interest Rate				8.20%		8.20%
Minimum [Member] | U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Stated Interest Rate						4.44%
Effective Interest Rate						4.44%
Maximum [Member] | U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Stated Interest Rate						4.64%
Effective Interest Rate						4.64%