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Description Of Business And Segment Reporting (Summary Of Results Of Operations For Principal Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | $ 49,228 | $ 61,492
Segment operating income (loss) | (7,039) | (1,360)
Operating Segments [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | 49,228 | 61,492
Segment operating income (loss) | (2,467) | 3,742
Intersegment Eliminations [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | (1,684) | (1,866)
Cinema Exhibition [Member] | Operating Segments [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | 46,310 | 57,927
Segment operating income (loss) | (2,654) | 2,583
Real Estate [Member] | Operating Segments [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | 4,602 | 5,431
Segment operating income (loss) | $ 187 | $ 1,159

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