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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | $ 76,096 | $ 84,262 | $ 137,646 | $ 160,133
Segment operating income | 5,817 | 8,614 | 4,515 | 14,306
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | 76,096 | 84,262 | 137,646 | 160,133
Segment operating income | 10,614 | 14,448 | 14,414 | 26,413
Inter-segment Elimination [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | (1,851) | (2,346) | (3,716) | (4,737)
Cinema Exhibition [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | 72,383 | 80,183 | 130,368 | 152,438
Segment operating income | 9,269 | 12,494 | 11,912 | 22,779
Real Estate [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Revenue | 5,564 | 6,425 | 10,994 | 12,432
Segment operating income | $ 1,345 | $ 1,954 | $ 2,502 | $ 3,634

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