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Description Of Business And Segment Reporting (Summary Of Results Of Operations For Principal Business Segments) (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | $ 139,060,000 | $ 77,862,000 | $ 276,768,000
Depreciation and amortization | (22,746,000) | (22,317,000) | (22,747,000)
General and administrative expense | (25,100,000) | (16,998,000) | (25,395,000)
Impairment of long-lived assets | 0 | (217,000) | 0
Total costs and expenses | (180,853,000) | (139,175,000) | (267,645,000)
Segment operating income (loss) | $ (41,793,000) | (61,313,000) | 9,123,000
Number of operating segments | segment | 2 |  |
Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | $ 139,575,000 | 79,977,000 | 284,094,000
Costs and expenses | (133,522,000) | (101,758,000) | (226,829,000)
Depreciation and amortization | (21,514,000) | (21,347,000) | (22,333,000)
Total costs and expenses | (163,567,000) | (127,496,000) | (255,624,000)
Segment operating income (loss) | (23,992,000) | (47,519,000) | 28,470,000
Intersegment Eliminations [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | (515,000) | (2,115,000) | (7,326,000)
Costs and expenses | (515,000) | (2,115,000) | (7,326,000)
Cinema Exhibition [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Impairment of long-lived assets |  | (217,000) |
Cinema Exhibition [Member] | Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | 126,812,000 | 67,014,000 | 262,189,000
Costs and expenses | (123,416,000) | (93,180,000) | (217,376,000)
Depreciation and amortization | (14,422,000) | (15,246,000) | (16,940,000)
Total costs and expenses | (145,449,000) | (112,070,000) | (238,860,000)
Segment operating income (loss) | (18,637,000) | (45,056,000) | 23,329,000
Cinema Exhibition [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Costs and expenses | (515,000) | (2,115,000) | (7,326,000)
Real Estate [Member] | Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | 12,763,000 | 12,963,000 | 21,905,000
Costs and expenses | (10,106,000) | (8,578,000) | (9,453,000)
Depreciation and amortization | (7,092,000) | (6,101,000) | (5,393,000)
Total costs and expenses | (18,118,000) | (15,426,000) | (16,764,000)
Segment operating income (loss) | (5,355,000) | (2,463,000) | 5,141,000
Real Estate [Member] | Intersegment Eliminations [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | (515,000) | (2,115,000) | (7,326,000)
Segment [Member] | Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
General and administrative expense | (8,531,000) | (4,174,000) | (6,462,000)
Segment [Member] | Cinema Exhibition [Member] | Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
General and administrative expense | (7,611,000) | (3,427,000) | (4,544,000)
Segment [Member] | Real Estate [Member] | Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
General and administrative expense | (920,000) | (747,000) | (1,918,000)
Third Party [Member] | Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | 139,060,000 | 77,862,000 | 276,768,000
Costs and expenses | (133,007,000) | (99,643,000) | (219,503,000)
Third Party [Member] | Cinema Exhibition [Member] | Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | 126,812,000 | 67,014,000 | 262,189,000
Costs and expenses | (122,901,000) | (91,065,000) | (210,050,000)
Third Party [Member] | Real Estate [Member] | Operating Segments [Member] |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue | 12,248,000 | 10,848,000 | 14,579,000
Costs and expenses | $ (10,106,000) | $ (8,578,000) | $ (9,453,000)

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