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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, 2018 USD ($) | [1] | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | [1] | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 74,990 | $ 74,261 | $ 84,262 | $ 75,872 | $ 71,841 | $ 66,116 | $ 72,440 | $ 69,481 | $ 309,385 | $ 279,879 | $ 270,866 | [2]
Cost of services and products |  |  |  |  |  |  |  |  |  | (244,722) | (224,456) | (214,933) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (22,275) | (16,942) | (15,689) | [2]
General and administrative expense |  |  |  |  |  |  |  |  |  | (27,337) | (25,347) | (26,906) | [2]
Total Costs and Expenses |  |  |  |  |  |  |  |  |  | (285,307) | (259,173) | (250,162) | [2]
Segment operating income |  |  |  |  |  |  |  |  |  | $ 24,078 | 20,706 | 20,704 | [2]
Number of segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 318,412 | 287,452 | 278,232 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (21,881) | (16,469) | (15,294) |
Total Costs and Expenses |  |  |  |  |  |  |  |  |  | (272,653) | (246,326) | (235,412) |
Segment operating income |  |  |  |  |  |  |  |  |  | 45,759 | 41,126 | 42,820 |
Inter-segment Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |  |  | (9,027) | (7,573) | (7,366) |
Total Costs and Expenses | [3] |  |  |  |  |  |  |  |  | 9,027 | 7,573 | 7,366 |
Cinema [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services and products |  |  |  |  |  |  |  |  |  | (234,818) | (215,020) | (205,889) |
Cinema [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 294,177 | 263,464 | 256,922 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (16,314) | (12,213) | (11,772) |
Total Costs and Expenses |  |  |  |  |  |  |  |  |  | (254,856) | (230,494) | (221,424) |
Segment operating income |  |  |  |  |  |  |  |  |  | 39,321 | 32,970 | 35,498 |
Cinema [Member] | Inter-segment Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services and products | [3] |  |  |  |  |  |  |  |  | (9,027) | (7,573) | (7,366) |
Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services and products |  |  |  |  |  |  |  |  |  | (9,904) | (9,436) | (9,044) |
Real Estate [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 24,235 | 23,988 | 21,310 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (5,567) | (4,256) | (3,522) |
Total Costs and Expenses |  |  |  |  |  |  |  |  |  | (17,797) | (15,832) | (13,988) |
Segment operating income |  |  |  |  |  |  |  |  |  | 6,438 | 8,156 | 7,322 |
Real Estate [Member] | Inter-segment Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [3] |  |  |  |  |  |  |  |  | (9,027) | (7,573) | (7,366) |
Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expense |  |  |  |  |  |  |  |  |  | (6,050) | (5,401) | (5,185) |
Segment [Member] | Cinema [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expense |  |  |  |  |  |  |  |  |  | (3,724) | (3,261) | (3,763) |
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 |  |  |  |  |  |  |  |  |  | (2,326) | (2,140) | (1,422) |
Third Party [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 309,385 | 279,879 | 270,866 |
Cost of services and products |  |  |  |  |  |  |  |  |  | (235,695) | (216,883) | (207,567) |
Third Party [Member] | Cinema [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 294,177 | 263,464 | 256,922 |
Cost of services and products |  |  |  |  |  |  |  |  |  | (225,791) | (207,447) | (198,523) |
Third Party [Member] | Real Estate [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 15,208 | 16,415 | 13,944 |
Cost of services and products |  |  |  |  |  |  |  |  |  | $ (9,904) | $ (9,436) | $ (9,044) |
[1] | Net income for the 4th quarter of 2017 includes approximately $2.5 million net tax benefit from non-recurring items of tax benefit and expense related to the Tax Cuts and Jobs Act enacted December 2017 and dissolution of a non-operating foreign subsidiary.
[2] | Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).
[3] | Inter-segment Revenues and Cost of services relates to the internal charge between the two segments where the cinema operates within real estate owned within the group.

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