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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Balance | $ 179,946 | $ 184,167 | $ 180,547 | $ 181,618
Net income (loss) | 2,394 | 5,027 | 313 | 8,108
Balance | 177,697 | 181,607 | 177,697 | 181,607
Reading International Inc. Stockholders' Equity [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Balance | 175,679 | 179,835 | 176,210 | 177,287
Net income (loss) |  |  |  | 8,108
Balance | $ 173,474 | 177,203 | $ 173,474 | 177,203
As Reported [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Net income (loss) |  | 4,999 |  | 8,045
As Reported [Member] | Reading International Inc. Stockholders' Equity [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Balance |  |  |  | 176,910
Net income (loss) |  |  |  | 8,045
Balance |  | 176,763 |  | 176,763
Adjustments [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Net income (loss) |  | 28 |  | 63
Adjustments [Member] | Reading International Inc. Stockholders' Equity [Member] |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Balance |  |  |  | 377
Net income (loss) |  |  |  | 63
Balance |  | $ 440 |  | $ 440

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