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Summary Of Significant Accounting Policies (Accounting Changes To Consolidated Statements Of Income) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue | $ 49,228 | $ 61,492
Operating income (loss) | (7,039) | (1,360)
Income (loss) before income taxes | (8,968) | (3,198)
Income tax benefit (expense) | 3,013 | 1,057
Net income (loss) | (5,955) | (2,141)
Net income (loss) attributable to Reading International, Inc. common shareholders | $ (5,875) | $ (2,125)
Basic earnings (loss) per share | $ (0.27) | $ (0.09)
Diluted earnings (loss) per share | $ (0.27) | $ (0.09)
Cinema [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue | $ 46,310 | $ 57,927
Tax Year 2019 [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue |  | 61,492
Operating income (loss) |  | (1,360)
Income (loss) before income taxes |  | (3,198)
Income tax benefit (expense) |  | 1,057
Net income (loss) |  | (2,141)
Net income (loss) attributable to Reading International, Inc. common shareholders |  | $ (2,125)
Basic earnings (loss) per share |  | $ (0.09)
Diluted earnings (loss) per share |  | $ (0.09)
Tax Year 2019 [Member] | Cinema [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue |  | $ 57,927
Tax Year 2019 [Member] | As Reported [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue |  | 61,551
Operating income (loss) |  | (1,301)
Income (loss) before income taxes |  | (3,139)
Income tax benefit (expense) |  | 1,042
Net income (loss) |  | (2,097)
Net income (loss) attributable to Reading International, Inc. common shareholders |  | $ (2,081)
Basic earnings (loss) per share |  | $ (0.09)
Diluted earnings (loss) per share |  | $ (0.09)
Tax Year 2019 [Member] | As Reported [Member] | Cinema [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue |  | $ 57,986
Tax Year 2019 [Member] | Adjustments [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue |  | (59)
Operating income (loss) |  | (59)
Income (loss) before income taxes |  | (59)
Income tax benefit (expense) |  | 15
Net income (loss) |  | (44)
Net income (loss) attributable to Reading International, Inc. common shareholders |  | $ (44)
Basic earnings (loss) per share |  | $ 0.00
Diluted earnings (loss) per share |  | $ 0.00
Tax Year 2019 [Member] | Adjustments [Member] | Cinema [Member] |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |
Revenue |  | $ (59)

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