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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
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Dec. 31, 2016 USD ($) | [1] | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | [1] | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  | $ 67,451 | $ 71,315 | $ 66,918 | $ 64,789 | $ 66,691 | $ 57,788 | $ 72,802 | $ 60,584 | $ 270,473 | $ 257,865 | [2],[3] | $ 255,242 | [2],[3]
Cost of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (207,567) | (200,955) | [2] | (198,205) | [2]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (15,689) | (14,562) | [3] | (15,468) | [3]
General and administrative expense |  |  |  |  |  |  |  |  |  | (26,906) | (18,652) | [3] | (18,902) | [3]
Total costs and expenses |  |  |  |  |  |  |  |  |  | (250,162) | (234,169) | [3] | (232,575) | [3]
Operating income |  |  |  |  |  |  |  |  |  | $ 20,311 | 23,696 | [3] | 22,667 | [3]
Number of segments | segment |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | $ 277,839 | 264,402 | [2] | 262,703 | [2]
Cost of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (214,933) | (207,492) | [2] | (205,666) | [2]
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (15,294) | (14,268) | [2] | (15,108) | [2]
Total costs and expenses |  |  |  |  |  |  |  |  |  | (228,046) | (218,951) | [2] | (217,930) | [2]
Operating income |  |  |  |  |  |  |  |  |  | 42,427 | 38,914 | [2],[4] | 37,312 | [2],[4]
Inter-segment Elimination [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | [5] |  |  |  |  |  |  |  |  | (7,366) | (6,537) | [2] | (7,461) | [2]
Total costs and expenses | [5] |  |  |  |  |  |  |  |  | (7,366) | (6,537) | [2] | (7,461) | [2]
Cinema Exhibition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 256,922 | 242,823 |  | 238,355 |
Cost of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (205,889) | (196,544) |  | (195,896) |
Cinema Exhibition [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 256,922 | 242,823 |  | 238,355 |
Cost of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (205,889) | (196,544) |  | (195,896) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (11,772) | (11,161) |  | (11,047) |
Total costs and expenses |  |  |  |  |  |  |  |  |  | (221,424) | (210,705) |  | (210,518) |
Operating income |  |  |  |  |  |  |  |  |  | 35,498 | 32,118 |  | 27,837 |
Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 20,917 | 21,579 |  | 24,348 |
Cost of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (9,044) | (10,948) |  | (9,770) |
Real Estate [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 20,917 | 21,579 |  | 24,348 |
Cost of services and products (excluding depreciation and amortization) |  |  |  |  |  |  |  |  |  | (9,044) | (10,948) |  | (9,770) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | (3,522) | (3,107) |  | (4,061) |
Total costs and expenses |  |  |  |  |  |  |  |  |  | (13,988) | (14,783) |  | (14,873) |
Operating income |  |  |  |  |  |  |  |  |  | 6,929 | 6,796 |  | 9,475 |
Segment [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expense |  |  |  |  |  |  |  |  |  | (5,185) | (3,728) | [2] | (4,617) | [2]
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 |  |  |  |  |  |  |  |  |  | (3,763) | (3,000) |  | (3,575) |
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 |  |  |  |  |  |  |  |  |  | $ (1,422) | $ (728) |  | $ (1,042) |
[1] | Fourth Quarter Results included the impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).
[2] | Balances relating to Cinema segment included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).
[3] | Certain 2015 and 2014 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).
[4] | 2015 and 2014 balances included the restatement impact as a result of a change in accounting principle (see Note 2 - Summary of Significant Accounting Policies - Accounting Changes).
[5] | Inter-segment eliminations relate to the internal charge between the two segments where the cinema operates within real estate owned within the group.

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