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Noncontrolling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Noncontrolling Interest [Line Items] |  |  |  |
Balance | $ 180,547 | $ 177,287 |  |
Net income (loss) | (2,097) | 3,104 |  |
Distributions to noncontrolling stockholders | (27) | (43) |  |
Accumulated other comprehensive income (loss) | (1) | 3 |  |
Balance | 179,946 | 179,835 |  |
Reading International Inc. Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Balance | 176,210 | 177,287 |  |
Net income (loss) | (2,081) | 3,082 |  |
Increase in additional paid in capital | 21 | 339 |  |
Treasury stock purchased | (9) | (317) |  |
Contributions from noncontrolling stockholders |  |  |  |
Distributions to noncontrolling stockholders |  |  |  |
Accumulated other comprehensive income (loss) | 1,510 | (750) |  |
Balance | 175,679 | 179,835 |  |
Noncontrolling Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Balance | 4,337 | 4,331 |  |
Net income (loss) | (16) | 22 |  |
Increase in additional paid in capital |  |  |  |
Treasury stock purchased |  |  |  |
Contributions from noncontrolling stockholders | 18 | 27 |  |
Distributions to noncontrolling stockholders | (27) | (43) |  |
Accumulated other comprehensive income (loss) | 1 | (3) |  |
Balance | 4,267 | 4,332 |  |
Total Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Balance | 180,547 | 181,618 |  |
Net income (loss) | (2,097) | 3,104 |  |
Increase in additional paid in capital | 21 | 339 |  |
Treasury stock purchased | (9) | (317) |  |
Contributions from noncontrolling stockholders | 18 | 27 |  |
Distributions to noncontrolling stockholders | (27) | (43) |  |
Accumulated other comprehensive income (loss) | 1,511 | (753) |  |
Balance | $ 179,946 | $ 184,167 |  |
Accounting Standards Update 2014-09 [Member] | Reading International Inc. Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Adjustments to opening retained earnings on adoption of ASC |  |  |  | $ 194
Accounting Standards Update 2014-09 [Member] | Noncontrolling Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Adjustments to opening retained earnings on adoption of ASC |  |  |  | (2)
Accounting Standards Update 2014-09 [Member] | Total Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Adjustments to opening retained earnings on adoption of ASC |  |  |  | $ 192
Accounting Standards Update 2016-02 [Member] | Reading International Inc. Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Adjustments to opening retained earnings on adoption of ASC |  |  | $ 28 |
Accounting Standards Update 2016-02 [Member] | Noncontrolling Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Adjustments to opening retained earnings on adoption of ASC |  |  | (46) |
Accounting Standards Update 2016-02 [Member] | Total Stockholders' Equity [Member] |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |
Adjustments to opening retained earnings on adoption of ASC |  |  | $ (18) |

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