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Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) a segment | Dec. 31, 2020 AUD ($) segment | Dec. 31, 2020 NZD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Restricted cash, Current |  | $ 8,000 |  |  | $ 7,000,000,000 |
Number of operating segments | segment |  | 2 | 2 | 2 |  |
Derivative position |  | $ 430,000 |  |  | 342,000 |
Impairment of long-lived assets |  | 217,000 |  |  |  |
Goodwill impairment |  | 0 |  |  | 0 | $ 0
Advertising expense |  | 700,000 |  |  | 1,800,000 | 2,400,000
Gains/(losses) on the settlement of litigation |  | 3,000 |  |  | (67,000) | 0
Non Income Producing Properties [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Impairment of long-lived assets |  | $ 217,000 |  |  | $ 0 | $ 0
Mt. Gravatt [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage |  | 33.30% |  |  |  |
Rialto Cinemas [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |  |
Australia [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Subsidies received |  | $ 9,500,000 | $ 12.3 |  |  |
New Zealand [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Subsidies received |  | $ 1,400,000 |  | $ 1.9 |  |
Australia Country Cinemas, Pty Ltd [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  | 75.00% |  |  |  |
Sutton Hill Properties, LLC [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  | 75.00% |  |  |  |
Shadow View Land And Farming, LLC [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage by parent |  | 50.00% |  |  |  |
Area of property | a |  | 202 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage |  | 20.00% |  |  |  |
Maximum [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |  |
Tax Year 2019 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Prior period immaterial error amount | $ 993,000 |  |  |  |  |

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