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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | $ 3,422 | $ 76,009 | $ 52,650 | $ 137,501
Segment operating income (loss) | (22,195) | 5,730 | (29,235) | 4,370
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | 3,422 | 76,009 | 52,650 | 137,501
Segment operating income (loss) | (18,061) | 10,527 | (20,528) | 14,269
Intersegment Eliminations [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | (98) | (1,851) | (1,782) | (3,716)
Cinema Exhibition [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | 1,217 | 72,296 | 47,527 | 130,223
Segment operating income (loss) | (17,254) | 9,182 | (19,908) | 11,767
Real Estate [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | 2,303 | 5,564 | 6,905 | 10,994
Segment operating income (loss) | $ (807) | $ 1,345 | $ (620) | $ 2,502

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