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Summary Of Significant Accounting Policies (Effect Of The Adoption Of ASC 606 On Financial Statements) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [2] | Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 74,990 | [1] | $ 74,261 | $ 84,262 | $ 75,872 | $ 71,841 | [1] | $ 66,116 | $ 72,440 | $ 69,481 | $ 309,385 | $ 279,879 | $ 270,866 |
Income tax expense |  |  |  |  |  |  |  |  |  |  | (3,420) | (3,380) | (4,138) |
Net income | 6,006 | [1] | $ 1,259 | $ 4,129 | $ 3,104 | 7,503 | [1] | $ 1,478 | $ 19,071 | $ 3,060 | 14,498 | 31,112 | 9,692 |
Deferred income taxes | 26,235 |  |  |  |  | 24,746 |  |  |  |  | 26,235 | 24,746 |  | $ 24,585
Deferred current revenue | 9,264 |  |  |  |  | 9,850 |  |  |  |  | 9,264 | 9,850 |  | 9,495
Retained earnings | 47,616 |  |  |  |  | $ 33,056 |  |  |  |  | 47,616 | 33,056 |  | $ 33,250
Balances Without Adoption of ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  | (3,356) |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 14,641 |  |  |
Deferred income taxes | 26,299 |  |  |  |  |  |  |  |  |  | 26,299 |  |  |
Deferred current revenue | 9,471 |  |  |  |  |  |  |  |  |  | 9,471 |  |  |
Retained earnings | 47,473 |  |  |  |  |  |  |  |  |  | 47,473 |  |  |
Effect Of Change Higher/(Lower) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  | 64 |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 143 |  |  |
Deferred income taxes | (64) |  |  |  |  |  |  |  |  |  | (64) |  |  |
Deferred current revenue | (207) |  |  |  |  |  |  |  |  |  | (207) |  |  |
Retained earnings | $ 143 |  |  |  |  |  |  |  |  |  | 143 |  |  |
Cinema [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 294,177 | $ 263,464 | $ 256,922 |
Cinema [Member] | Balances Without Adoption of ASC 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 293,970 |  |  |
Cinema [Member] | Effect Of Change Higher/(Lower) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | $ 207 |  |  |
[1] | Net income for the 4th quarter of 2017 includes approximately $2.5 million net tax benefit from non-recurring items of tax benefit and expense related to the Tax Cuts and Jobs Act enacted December 2017 and dissolution of a non-operating foreign subsidiary.
[2] | 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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