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Guaranteed And Indemnity Loss Coverage

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Related Parties (Narrative) (Details)								12 Months Ended
Related Parties (Narrative) (Details)	Nov. 06, 2020 USD ($)	Oct. 01, 2020 USD ($)	Mar. 13, 2020 USD ($) item	Mar. 12, 2020	Aug. 31, 2016 USD ($)	Jan. 01, 2015	Jun. 28, 2007 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2012 USD ($)	Mar. 29, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jan. 01, 2019 USD ($)	Feb. 28, 2015 USD ($)
Related Party Transaction [Line Items]
Total operating property								$ 353,125,000	$ 258,138,000							$ 258,037,000
Operating lease liabilities - current								22,699,000	20,379,000							$ 245,280,000
Contributions from noncontrolling stockholders								55,000	90,000	$ 82,000
Renovation amount								253,419,000	149,852,000
Capital call								0	0	0	$ 506,000
Contractual facility								300,449,000	283,138,000
Rent charge								302,910,000
Proceeds from contributions		$ 750,000
US Cinema 1, 2, 3 Term Loan [Member]
Related Party Transaction [Line Items]
Contractual facility			$ 25,000,000.0		$ 20,000,000.0			$ 24,625,000	$ 18,658,000
Maturity date			Apr. 01, 2022		Mar. 01, 2021			Apr. 01, 2022	Apr. 01, 2022
Number of extension options \| item			2
Extension period			6 months		12 months
Interest rate			4.25%		3.25%
Shadow View Land And Farming, LLC [Member]
Related Party Transaction [Line Items]
Noncontrolling interests								50.00%
Sutton Hill Properties, LLC [Member]
Related Party Transaction [Line Items]
Payments of distributions		1,000,000.0
Sutton Hill Properties, LLC [Member] \| US Cinema 1, 2, 3 Term Loan [Member]
Related Party Transaction [Line Items]
Contractual facility					$ 15,000,000.0
Cinemas 1, 2, 3 [Member]
Related Party Transaction [Line Items]
Improvement fee									$ 96,000	425,000
Management fee												$ 177,000
Incremental positive cash flow percentage						100.00%
Average annual positive cash flow period						3 years
Annual cash-on-cash return percent						15.00%
Sutton Hill Capital, LLC [Member]
Related Party Transaction [Line Items]
Lease expiration date								Jun. 30, 2020
Payment to acquire interest in special purpose entity							$ 3,000,000.0
Management fee	$ 112,500
Debt amount							26,900,000
Due from related party							$ 2,900,000
Renovation amount																	$ 750,000
Capital call											$ 169,000
Guarantee and indemnity percentage								25.00%
Rent charge								$ 590,000
Lease payment								148,000	590,000	590,000
Deferred rent								$ 442,000
Sutton Hill Capital, LLC [Member] \| Sutton Hill Properties, LLC [Member]
Related Party Transaction [Line Items]
Payments of distributions		$ 250,000
Sutton Hill Capital, LLC [Member] \| Cinemas 1, 2, 3 [Member]
Related Party Transaction [Line Items]
Percent of management fee equal to SHP's gross income								5.00%
Sutton Hill Capital's Interest In Sutton Hill Properties [Member]
Related Party Transaction [Line Items]
Special purpose entity purchase option, percentage								25.00%
James Cotter And Michael Forman [Member]
Related Party Transaction [Line Items]
Ownership percentage in live theater play investment								5.00%
Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Contributions from noncontrolling stockholders													$ 2,500,000
Bonus contributed to acquire land													$ 255,000
Chief Executive Officer [Member] \| Shadow View Land And Farming, LLC [Member]
Related Party Transaction [Line Items]
Noncontrolling interests													50.00%
Percentage of costs associated with acquisition													50.00%
Cinema Ground Lease [Member]
Related Party Transaction [Line Items]
Lease expiration date								Jun. 01, 2031
86th Street Cinema [Member]
Related Party Transaction [Line Items]
Management fee								$ 0	$ 45,000	$ 172,000
Village East Cinema [Member]
Related Party Transaction [Line Items]
Lease expiration date				Jan. 31, 2022
Lease term								13 years
Operating lease liabilities - current								$ 0.0
Village East Cinema [Member] \| Sutton Hill Capital, LLC [Member]
Related Party Transaction [Line Items]
Lease term								10 years
Purchase option								$ 5,900,000							$ 5,900,000
Total operating property								4,700,000
Operating lease liabilities - current								$ 5,900,000
Village East Cinema [Member] \| Sutton Hill Capital, LLC [Member] \| Subsequent Event [Member]
Related Party Transaction [Line Items]
Purchase option														$ 5,900,000
Valley Nattional Bank [Member] \| US Cinema 1, 2, 3 Term Loan [Member]
Related Party Transaction [Line Items]
Contractual facility			$ 25,000,000.0
Maturity date			Apr. 01, 2022
Number of extension options \| item			2
Extension period			6 months
Interest rate			4.25%
Extended maturity date			Apr. 01, 2023