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Impact of COVID-19 Pandemic And Liquidity (Narrative) (Details) |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
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Mar. 31, 2021 item | Mar. 26, 2021 USD ($) | Mar. 06, 2020 USD ($) | Dec. 29, 2016 USD ($) | Mar. 03, 2016 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 31, 2021 USD ($)
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 217,000 |  |  |
Working capital |  |  |  |  |  | $ 64,100,000 |  |  |  |  | $ (84,100,000) |  |  |  |  | 64,100,000 | $ (84,100,000) |  |
Contractual Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,449,000 | 283,138,000 |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 217,000 |  |  |
Revenue |  |  |  |  |  | 15,021,000 | [1] | $ 10,191,000 | $ 3,422,000 | $ 49,228,000 | $ 68,880,000 | [1] | $ 70,386,000 | $ 76,009,000 | $ 61,493,000 | 77,862,000 | 276,768,000 | $ 308,931,000 |
Net operating loss carry forwards |  |  |  |  |  | 5,100,000 |  |  |  |  |  |  |  |  |  | 5,100,000 |  |  |
Book value |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 |  |  |
Bank Of America Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Facility |  |  | $ 55,000,000.0 |  | $ 55,000,000.0 |  |  |  |  |  |  |  |  |  |  | 55,000,000 | $ 55,000,000 |  |
Remaining Facility |  |  |  |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  | $ 3,800,000 |  |  |
44 Union Square [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Facility |  |  |  | $ 57,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax refund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,100,000
Subsequent Event [Member] | 44 Union Square [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of notes payable |  | $ 40,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cinemas closed | item | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cinemas opened | item | 19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cinemas | item | 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Since previously published financial statements have been corrected, there is no impact on the fourth quarter results for 2019 or for the full year of 2020 and so no data is displayed here.

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