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Impact of COVID-19 Pandemic And Liquidity (Narrative) (Details) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2021 NZD ($) | May 07, 2021 NZD ($) | Mar. 06, 2020 USD ($) | Sep. 30, 2021 USD ($) item | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) item | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |
Net increase (decrease) in cash and cash equivalents |  |  |  |  | $ 179,100,000 | $ 64,061,000 | $ 15,640,000 |
Debt and Capital Lease Obligations |  |  |  | $ 282,600,000 |  | $ 282,600,000 |  | $ 242,600,000
Number of cinemas re-opened | item |  |  |  |  |  | 58 |  |
Number of cinemas | item |  |  |  | 62 |  | 62 |  |
Contractual Facility |  |  |  |  |  | $ 269,953,000 |  | 300,449,000
Impairment of long-lived assets |  |  |  |  |  |  |  | 217,000
Goodwill, Impairment Loss |  |  |  | $ 0 |  | 0 |  |
Proceeds from sale of assets |  |  |  |  |  | 145,165,000 |  |
Repayment of long-term borrowings |  |  |  |  |  | $ 79,357,000 | $ 28,910,000 |
Shadow View Land And Farming, LLC [Member] |  |  |  |  |  |  |  |
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling interest |  |  |  | 50.00% |  | 50.00% |  |
Bank Of America Credit Facility [Member] |  |  |  |  |  |  |  |
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |
Contractual Facility |  |  | $ 55,000,000.0 |  |  | $ 55,000,000 |  | 55,000,000
Westpac Bank Corporate Credit Facility [Member] |  |  |  |  |  |  |  |
Impact Of Covid [Line Items] |  |  |  |  |  |  |  |
Contractual Facility | $ 13.8 | $ 16.0 |  |  |  | $ 9,548,000 |  | $ 23,021,000
Repayment of long-term borrowings | $ 2.2 | $ 16.0 |  |  |  |  |  |

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