Borrowings (Summary Of Borrowings) (Details) - USD ($) $ in Thousands													1 Months Ended	2 Months Ended	12 Months Ended
		Mar. 13, 2020	Mar. 06, 2020	Sep. 18, 2019	Aug. 08, 2019	Mar. 05, 2019	Oct. 12, 2018	Oct. 11, 2018	Feb. 05, 2018	Dec. 13, 2016	Aug. 31, 2016	Mar. 03, 2016	Oct. 31, 2016	Apr. 30, 2018	Dec. 31, 2020		Dec. 31, 2019
Debt Instrument [Line Items]
Contractual Facility															$ 300,449		$ 283,138
Balance Gross															284,959		209,218
Balance Net															282,583	[1]	207,012	[2]
Deferred financing costs, net															$ 2,400		$ 2,200
Trust Preferred Securities [Member]
Debt Instrument [Line Items]
Maturity Date															Apr. 30, 2027		Apr. 30, 2027
Contractual Facility								$ 1,600							$ 27,913		$ 27,913
Balance Gross															27,913		27,913
Balance Net															$ 26,505	[1]	$ 26,311	[2]
Stated Interest Rate															4.27%		5.94%
Effective Interest Rate															4.27%		5.94%
Bank Of America Credit Facility [Member]
Debt Instrument [Line Items]
Maturity Date			Mar. 06, 2023		Sep. 01, 2020	May 01, 2020									Mar. 06, 2023		Mar. 06, 2023
Contractual Facility			$ 55,000									$ 55,000			$ 55,000		$ 55,000
Balance Gross															51,200		33,500
Balance Net															$ 50,990	[1]	$ 33,445	[2]
Stated Interest Rate															4.00%		4.80%
Effective Interest Rate															4.00%		4.80%
Bank Of America Line Of Credit [Member]
Debt Instrument [Line Items]
Maturity Date					Sep. 01, 2020								Oct. 31, 2019		Mar. 06, 2023		Mar. 06, 2023
Contractual Facility													$ 5,000		$ 5,000		$ 5,000
Balance Gross															5,000
Balance Net	[1]														$ 5,000
Stated Interest Rate															3.15%		4.80%
Effective Interest Rate															3.15%		4.80%
Banc Of America Digital Projector Loan [Member]
Debt Instrument [Line Items]
Contractual Facility									$ 4,600					$ 4,900
US Cinema 1, 2, 3 Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date		Apr. 01, 2022									Mar. 01, 2021				Apr. 01, 2022		Apr. 01, 2022
Contractual Facility		$ 25,000									$ 20,000				$ 24,625		$ 18,658
Balance Gross															24,625		18,658
Balance Net															$ 24,248	[1]	$ 18,532	[2]
Stated Interest Rate															4.25%		3.25%
Effective Interest Rate															4.25%		3.25%
Minetta And Orpheum Theatres Loan [Member]
Debt Instrument [Line Items]
Maturity Date	[3]														Nov. 01, 2023		Nov. 01, 2023
Contractual Facility							$ 7,500								$ 8,000	[3]	$ 8,000	[3]
Balance Gross	[3]														8,000		8,000
Balance Net	[3]														$ 7,914	[1]	$ 7,887	[2]
Stated Interest Rate	[3]														2.20%		3.74%
Effective Interest Rate	[3]														5.15%		5.15%
U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date															Jan. 01, 2027		Jan. 01, 2027
Contractual Facility										$ 8,400					$ 9,186		$ 9,260
Balance Gross															9,186		9,260
Balance Net															$ 9,095	[1]	$ 9,153	[2]
Effective Interest Rate															4.64%		4.64%
Union Square Construction Financing [Member]
Debt Instrument [Line Items]
Maturity Date															Mar. 31, 2021		Dec. 29, 2020
Contractual Facility															$ 50,000		$ 50,000
Balance Gross															40,623		36,048
Balance Net															$ 40,620	[1]	$ 36,035	[2]
Stated Interest Rate															17.50%		6.02%
Effective Interest Rate															17.50%		6.02%
Purchase Money Promissory Note [Member]
Debt Instrument [Line Items]
Maturity Date				Sep. 18, 2024											Sep. 18, 2024		Sep. 18, 2024
Contractual Facility															$ 2,883		$ 3,363
Balance Gross															2,883		3,363
Balance Net															$ 2,883	[1]	$ 3,363	[2]
Stated Interest Rate															5.00%		5.00%
Effective Interest Rate															5.00%		5.00%
NAB Australian Corporate Term Loan [Member]
Debt Instrument [Line Items]
Maturity Date	[4]														Dec. 31, 2023
Contractual Facility	[4]														$ 94,821
Balance Gross	[4]														92,508
Balance Net	[1],[4]														$ 92,307
Stated Interest Rate	[4]														1.81%
Effective Interest Rate	[4]														1.81%
NAB Corporate Loan Facility [Member]
Debt Instrument [Line Items]
Maturity Date	[5]																Dec. 31, 2023
Contractual Facility	[5]																$ 84,360
Balance Gross	[5]																65,731
Balance Net	[2],[5]																$ 65,541
Stated Interest Rate	[5]																1.77%
Effective Interest Rate	[5]																1.77%
Westpac Bank Corporate Credit Facility [Member]
Debt Instrument [Line Items]
Maturity Date															Dec. 31, 2023	[4]	Dec. 31, 2023	[5]
Contractual Facility															$ 23,021	[4]	$ 21,584	[5]
Balance Gross															23,021	[4]	6,745	[5]
Balance Net															$ 23,021	[1],[4]	$ 6,745	[2],[5]
Stated Interest Rate															2.95%	[4]	3.05%	[5]
Effective Interest Rate															2.95%	[4]	3.05%	[5]
Minetta and Orpheum Loan [Member]
Debt Instrument [Line Items]
Effective Interest Rate															5.15%
Minimum [Member] | U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Stated Interest Rate															4.44%		4.44%
Maximum [Member] | U.S. Corporate Office Term Loan [Member]
Debt Instrument [Line Items]
Stated Interest Rate															4.64%		4.64%

[1] Net of deferred financing costs amounting to $2.4 million.

[2] Net of deferred financing costs amounting to $2.2 million.

[3] The interest rate derivative associated with the Minetta & Orpheum loan provides for an effective fixed rate of 5.15%.

[4] The contractual facilities and outstanding balances of the FC-denominated borrowings were translated into U.S. dollars based on exchange rates as of December 31, 2020.

[5] The contractual facilities and outstanding balances of the FC-denominated borrowings were translated into U.S. dollar based on exchange rates as of December 31, 2019.