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Summary Of Significant Accounting Policies (Impact Of Adoption Of ASC 842 And ASC 606 On The Statements Of Income And Balance Sheet) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  | $ 139,175 | $ 267,645 | $ 285,307 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 22,317 | 22,747 | 22,275 |
General and administrative |  |  |  |  |  |  |  |  |  |  | 16,998 | 25,395 | 27,337 |
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 9,354 | 7,904 | 6,837 |
Revenue | $ 15,021 | [1] | $ 10,191 | $ 3,422 | $ 49,228 | $ 68,880 | [1] | $ 70,386 | $ 76,009 | $ 61,493 | 77,862 | 276,768 | 308,931 |
Income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | 4,967 | (28,837) | (3,298) |
Net income (loss) | (17,663) | [1] | (19,352) | (22,887) | (5,955) | (27,458) | [1] | 801 | 2,294 | (2,140) | (65,857) | (26,503) | 14,166 |
Operating property, net | 353,125 |  |  |  |  | 258,138 |  |  |  |  | 353,125 | 258,138 |  | $ 258,037
Intangible assets | 3,971 |  |  |  |  | 4,320 |  |  |  |  | 3,971 | 4,320 |  | 3,827
Operating lease right-of-use assets | 220,503 |  |  |  |  | 229,879 |  |  |  |  | 220,503 | 229,879 |  | 232,319
Deferred tax asset, net | 3,362 |  |  |  |  | 3,444 |  |  |  |  | 3,362 | 3,444 |  | 26,526
Other current liabilities | 3,826 |  |  |  |  | 3,653 |  |  |  |  | 3,826 | 3,653 |  |
Operating lease liabilities - current | 22,699 |  |  |  |  | 20,379 |  |  |  |  | 22,699 | 20,379 |  | 245,280
Other liabilities | 22,017 |  |  |  |  | 18,854 |  |  |  |  | 22,017 | 18,854 |  | 12,898
Operating lease liabilities - non-current | 212,806 |  |  |  |  | 223,164 |  |  |  |  | 212,806 | 223,164 |  |
Deferred revenue | 10,133 |  |  |  |  | 11,324 |  |  |  |  | 10,133 | 11,324 |  |
Retained earnings (deficit) | (44,553) |  |  |  |  | 20,647 |  |  |  |  | (44,553) | 20,647 |  | $ 47,076
Balance Without Adoption Of ASC 842 [[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 22,224 | 22,582 |  |
General and administrative |  |  |  |  |  |  |  |  |  |  | 17,098 | 25,569 |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 9,346 | 7,891 |  |
Income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | 4,914 | (28,819) |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | (65,966) | (26,541) |  |
Operating property, net | 353,013 |  |  |  |  | 257,933 |  |  |  |  | 353,013 | 257,933 |  |
Intangible assets | 6,275 |  |  |  |  | 7,523 |  |  |  |  | 6,275 | 7,523 |  |
Deferred tax asset, net | 3,352 |  |  |  |  | 3,380 |  |  |  |  | 3,352 | 3,380 |  |
Other current liabilities | 4,006 |  |  |  |  | 3,789 |  |  |  |  | 4,006 | 3,789 |  |
Other liabilities | 38,855 |  |  |  |  | 35,276 |  |  |  |  | 38,855 | 35,276 |  |
Retained earnings (deficit) | 81,008 |  |  |  |  | 139,578 |  |  |  |  | 81,008 | 139,578 |  |
Effect Of Change Higher/(Lower) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 93 | 165 |  |
General and administrative |  |  |  |  |  |  |  |  |  |  | (100) | (174) |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  | 8 | 13 |  |
Income tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | (53) | (18) |  |
Net income (loss) |  |  |  |  |  |  |  |  |  |  | 109 | 38 |  |
Operating property, net | 112 |  |  |  |  | 205 |  |  |  |  | 112 | 205 |  |
Intangible assets | (2,304) |  |  |  |  | (3,203) |  |  |  |  | (2,304) | (3,203) |  |
Operating lease right-of-use assets | 220,503 |  |  |  |  | 229,879 |  |  |  |  | 220,503 | 229,879 |  |
Deferred tax asset, net | 10 |  |  |  |  | 64 |  |  |  |  | 10 | 64 |  |
Other current liabilities | (180) |  |  |  |  | (136) |  |  |  |  | (180) | (136) |  |
Operating lease liabilities - current | 22,699 |  |  |  |  | 20,379 |  |  |  |  | 22,699 | 20,379 |  |
Other liabilities | (16,838) |  |  |  |  | (16,422) |  |  |  |  | (16,838) | (16,422) |  |
Operating lease liabilities - non-current | 212,806 |  |  |  |  | 223,164 |  |  |  |  | 212,806 | 223,164 |  |
Retained earnings (deficit) | 165 |  |  |  |  | 38 |  |  |  |  | 165 | 38 |  |
Cinema [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  | 91,065 | 210,050 | 225,791 |
Revenue |  |  |  |  |  |  |  |  |  |  | 67,014 | 262,189 | 293,723 |
Cinema [Member] | Balance Without Adoption Of ASC 842 [[Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  | 91,228 | 210,110 |  |
Cinema [Member] | Effect Of Change Higher/(Lower) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Costs and expenses |  |  |  |  |  |  |  |  |  |  | (163) | (60) |  |
As Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 15,021 | [1] | 10,191 | 3,422 | 49,228 | 68,880 | [1] | 70,456 | 76,096 | 61,551 |  |  |  |
Net income (loss) | (17,663) | [1] | $ (19,352) | $ (22,887) | $ (5,955) | (27,458) | [1] | $ 852 | $ 2,357 | $ (2,097) |  |  |  |
Operating property, net | 353,125 |  |  |  |  | 258,138 |  |  |  |  | 353,125 | 258,138 | 257,667 |
Intangible assets | 3,971 |  |  |  |  | 4,320 |  |  |  |  | 3,971 | 4,320 | 7,369 |
Operating lease right-of-use assets | 220,503 |  |  |  |  | 229,879 |  |  |  |  | 220,503 | 229,879 |  |
Deferred tax asset, net | 3,362 |  |  |  |  | 3,444 |  |  |  |  | 3,362 | 3,444 | 26,444 |
Other current liabilities | 3,826 |  |  |  |  | 3,653 |  |  |  |  | 3,826 | 3,653 |  |
Operating lease liabilities - current | 22,699 |  |  |  |  | 20,379 |  |  |  |  | 22,699 | 20,379 |  |
Other liabilities | 22,017 |  |  |  |  | 18,854 |  |  |  |  | 22,017 | 18,854 | 28,931 |
Operating lease liabilities - non-current | 212,806 |  |  |  |  | 223,164 |  |  |  |  | 212,806 | 223,164 |  |
Retained earnings (deficit) | $ 81,173 |  |  |  |  | $ 139,616 |  |  |  |  | $ 81,173 | $ 139,616 | $ 47,048 |
[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.

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