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Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | $ 139,616 |  |  |  |  | $ 179,979 | $ 139,616 | $ 179,979 | $ 181,382
Net income (loss) attributable to Reading International, Inc. common shareholders | $ (17,663) | [1] | $ (19,352) | $ (22,887) | (5,955) | $ (27,458) | [1] | $ 801 | $ 2,294 | (2,140) | (65,857) | (26,503) | 14,166
Balance | 81,173 |  |  |  |  | 139,616 |  |  |  |  | 81,173 | 139,616 | 179,979
Reading International Inc. Stockholders' Equity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  | 135,349 |  |  |  |  | 175,642 | 135,349 | 175,642 | 177,051
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  | (65,200) | (26,429) | 14,034
Balance | 77,769 |  |  |  |  | 135,349 |  |  |  |  | $ 77,769 | 135,349 | 175,642
As Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Reading International, Inc. common shareholders | $ (17,663) | [1] | $ (19,352) | $ (22,887) | $ (5,955) | $ (27,458) | [1] | 852 | 2,357 | (2,097) |  |  |
Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  |  |  |  |  |  | $ (51) | $ (63) | (43) |  |  |
Tax Year 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | 14,166
Tax Year 2018 [Member] | As Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | 14,498
Tax Year 2018 [Member] | Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | (332)
Tax Year 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  | 179,979 |  | 179,979 | 181,382
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | 14,166
Balance |  |  |  |  |  |  |  |  |  |  |  |  | 179,979
Tax Year 2019 [Member] | As Reported [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  | 180,547 |  | 180,547 | 181,618
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | 14,498
Balance |  |  |  |  |  |  |  |  |  |  |  |  | 180,547
Tax Year 2019 [Member] | Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  |  |  |  |  |  |  | $ (568) |  | $ (568) | (236)
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | (332)
Balance |  |  |  |  |  |  |  |  |  |  |  |  | $ (568)
[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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