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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, 2019 | Mar. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | $ 61,551 | $ 75,872
Segment operating income | (1,301) | 5,693
Operating Segments [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | 61,551 | 75,872
Segment operating income | 3,801 | 11,966
Inter-segment Elimination [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | (1,866) | (2,391)
Cinema Exhibition [Member] | Operating Segments [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | 57,986 | 72,255
Segment operating income | 2,642 | 10,285
Real Estate [Member] | Operating Segments [Member] |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |
Revenue | 5,431 | 6,008
Segment operating income | $ 1,159 | $ 1,681

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