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Description Of Business And Segment Reporting (Summary Of Results Of Operations For Principal Business Segments) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | [1] | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | [1] | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 15,021 | $ 10,191 | $ 3,422 | $ 49,228 | $ 68,880 | $ 70,386 | $ 76,009 | $ 61,493 | $ 77,862 | $ 276,768 | $ 308,931
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (22,317) | (22,747) | (22,275)
General and administrative expense |  |  |  |  |  |  |  |  |  | (16,998) | (25,395) | (27,337)
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | (217) |  |
Total costs and expenses |  |  |  |  |  |  |  |  |  | (139,175) | (267,645) | (285,307)
Segment operating income (loss) |  |  |  |  |  |  |  |  |  | $ (61,313) | 9,123 | 23,624
Number of operating segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 79,977 | 284,094 | 317,958
Total of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (101,758) | (226,829) | (244,722)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (21,347) | (22,333) | (21,881)
Total costs and expenses |  |  |  |  |  |  |  |  |  | (127,496) | (255,624) | (272,653)
Segment operating income (loss) |  |  |  |  |  |  |  |  |  | (47,519) | 28,470 | 45,305
Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |  |  | (2,115) | (7,326) | (9,027)
Total of services and products (excluding depreciation and amortization) | [2] |  |  |  |  |  |  |  |  | (2,115) | (7,326) | (9,027)
Cinema Exhibition [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  |  |  | (217) |  |
Cinema Exhibition [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 67,014 | 262,189 | 293,723
Total of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (93,180) | (217,376) | (234,818)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (15,246) | (16,940) | (16,314)
Total costs and expenses |  |  |  |  |  |  |  |  |  | (112,070) | (238,860) | (254,856)
Segment operating income (loss) |  |  |  |  |  |  |  |  |  | (45,056) | 23,329 | 38,867
Cinema Exhibition [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total of services and products (excluding depreciation and amortization) | [2] |  |  |  |  |  |  |  |  | (2,115) | (7,326) | (9,027)
Real Estate [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 12,963 | 21,905 | 24,235
Total of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (8,578) | (9,453) | (9,904)
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (6,101) | (5,393) | (5,567)
Total costs and expenses |  |  |  |  |  |  |  |  |  | (15,426) | (16,764) | (17,797)
Segment operating income (loss) |  |  |  |  |  |  |  |  |  | (2,463) | 5,141 | 6,438
Real Estate [Member] | Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [2] |  |  |  |  |  |  |  |  | (2,115) | (7,326) | (9,027)
Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expense |  |  |  |  |  |  |  |  |  | (4,174) | (6,462) | (6,050)
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 |  |  |  |  |  |  |  |  |  | (3,427) | (4,544) | (3,724)
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 |  |  |  |  |  |  |  |  |  | (747) | (1,918) | (2,326)
Third Party [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 77,862 | 276,768 | 308,931
Total of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (99,643) | (219,503) | (235,695)
Third Party [Member] | Cinema Exhibition [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 67,014 | 262,189 | 293,723
Total of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (91,065) | (210,050) | (225,791)
Third Party [Member] | Real Estate [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 10,848 | 14,579 | 15,208
Total of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | $ (8,578) | $ (9,453) | $ (9,904)
[1] | Since previously published financial statements have been corrected, there is no impact on the fourth quarter results for 2019 or for the full year of 2020 and so no data is displayed here.
[2] | Inter-segment Revenues and Operating Expense relates to the internal charge between the two segments where the cinema operates within real estate owned within the group.

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(g)(1)(ii)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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