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Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Balance | $ 139,616 | $ 179,979
Net income (loss) | (5,955) | (2,141)
Balance | 117,400 | 179,334
Reading International Inc. Stockholders' Equity [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Balance | 135,349 | 175,642
Net income (loss) | (5,875) | (2,125)
Balance | $ 113,231 | 175,067
Tax Year 2019 [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Balance |  | 179,979
Net income (loss) |  | (2,141)
Balance |  | 179,334
Tax Year 2019 [Member] | As Reported [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Balance |  | 180,547
Net income (loss) |  | (2,097)
Balance |  | 179,946
Tax Year 2019 [Member] | Adjustments [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Balance |  | (568)
Net income (loss) |  | (44)
Balance |  | $ (612)

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