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Summary Of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) a segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash, Current | $ 17,000 |  | $ 1,300,000 | $ 17,000 |  |  |
Number of segments | segment |  |  | 2 |  |  |  |
Derivative position |  |  | $ 186,000 |  |  |  |
Goodwill impairment |  |  | 0 | 0 | $ 0 |  |
Advertising expense |  |  | 2,400,000 | 2,300,000 | 2,300,000 |  |
Gains/(losses) on the settlement of litigation |  |  |  | 1,800,000 | 415,000 |  |
Deferred tax asset | 24,746,000 |  | 26,235,000 | 24,746,000 |  |  |
Occupancy cost expense |  |  | (9,904,000) | (9,437,000) | (9,044,000) | [1] |
Prior period immaterial error amount |  | $ 440,000 |  |  |  |  |
Non Income Producing Properties [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Impairment losses |  |  | $ 0 | $ 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% |  |  |  |
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | $ 250,000,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  |  |  |  |  |  | us-gaap:Liabilities
Right-of-use assets |  |  |  |  |  |  | $ 250,000,000
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] |  |  |  |  |  |  | us-gaap:Assets
Australian 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% |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  | 20.00% |  |  |  |
Lease term of contract |  |  | 5 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  | 50.00% |  |  |  |
Operating lease renewal term |  |  | 20 years |  |  |  |
Lease term of contract |  |  | 15 years |  |  |  |
Shadow View Land And Farming, LLC [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Area of property | a |  |  | 202 |  |  |  |
Adjustments [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Deferred tax asset |  |  |  |  | $ 611,000 |  |
Occupancy cost expense | $ 544,000 |  |  |  |  |  |
[1] | Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).

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