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Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Balance | $ 117,399 | $ 139,616 | $ 179,335 | $ 179,979 | $ 139,616 | $ 179,979
Net income (loss) attributable to Reading International, Inc. common shareholders | (22,887) | (5,956) | 2,294 | (2,140) | (28,843) | 154
Balance | 105,586 | 117,399 | 177,023 | 179,335 | 105,586 | 177,023
Reading International Inc. Stockholders' Equity [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Balance | 113,231 | 135,349 | 175,068 | 175,642 | 135,349 | 175,642
Net income (loss) attributable to Reading International, Inc. common shareholders | (22,702) | (5,875) | 2,331 | (2,124) |  |
Balance | $ 101,594 | $ 113,231 | 172,800 | 175,068 | $ 101,594 | 172,800
Tax Year 2019 [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Balance |  |  |  | 179,979 |  | 179,979
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  | 2,294 |  |  | 154
Balance |  |  | 177,023 |  |  | 177,023
Tax Year 2019 [Member] | As Reported [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Balance |  |  |  | 180,547 |  | 180,547
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  | 2,357 |  |  | 260
Balance |  |  | 177,697 |  |  | 177,697
Tax Year 2019 [Member] | Adjustments [Member] |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Balance |  |  |  | $ (568) |  | (568)
Net income (loss) attributable to Reading International, Inc. common shareholders |  |  | (63) |  |  | (106)
Balance |  |  | $ (674) |  |  | $ (674)

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