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Non-controlling Interests (Summary Of Changes In Controlling And Non-controlling Stockholders’ Equity) (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Balance | $ (40,407,000) |
Balance | 81,173,000 | $ 139,616,000
Net income (loss) | 22,068,000 | (5,955,000)
Other comprehensive income, net | (2,545,000) | (15,897,000)
Share-based compensation expense | 464,000 | 336,000
Share repurchase plan |  | (671,000)
Restricted Stock Units | (110,000) | (30,000)
Distributions to noncontrolling stockholders | (5,300,000) |
Balance | 95,750,000 | 117,400,000
Balance | (40,407,000) |
Additional Paid-In Capital [Member] |  |
Balance | 149,979,000 | 148,602,000
Share-based compensation expense | 464,000 | 336,000
Restricted Stock Units | (111,000) | (30,000)
Balance | 150,332,000 | 148,908,000
Retained Earnings (Accumulated Deficit) [Member] |  |
Balance | (44,553,000) | 20,647,000
Net income (loss) | 18,965,000 | (5,875,000)
Balance | (25,588,000) | 14,772,000
Treasury Shares [Member] |  |
Balance | (40,407,000) | $ (39,737)
Share repurchase plan, shares |  | (670)
Balance | (40,407,000) | $ (40,407)
Accumulated Other Comprehensive Income (Loss) [Member] |  |
Balance | 12,502,000 | 5,589,000
Other comprehensive income, net | (2,545,000) | (15,879,000)
Balance | 9,957,000 | (10,290,000)
Reading International Inc. Stockholders' Equity [Member] |  |
Balance | 77,769,000 | 135,349,000
Net income (loss) | 18,965,000 | (5,875,000)
Other comprehensive income, net | (2,545,000) | (15,879,000)
Share-based compensation expense | 464,000 | 336,000
Share repurchase plan |  | (671,000)
Restricted Stock Units | (110,000) | (30,000)
Balance | 94,543,000 | 113,231,000
Noncontrolling Interests [Member] |  |
Balance | 3,404,000 | 4,267,000
Net income (loss) | 3,103,000 | (80,000)
Other comprehensive income, net |  | (18,000)
Distributions to noncontrolling stockholders | (5,300,000) |
Balance | $ 1,207,000 | 4,169,000
Class A [Member] |  |
Balance, shares | 20,068,607 |
Balance, shares | 20,120,625 |
Class A [Member] | Common Stock Shares Outstanding [Member] |  |
Balance | $ 231,000 | $ 231,000
Balance, shares | 20,069 | 20,103
Share repurchase plan, shares |  | (75)
Restricted Stock Units | $ 1,000 |
Restricted Stock Units, shares | 52 | 19
Balance | $ 232,000 | $ 231,000
Balance, shares | 20,121 | 20,047
Class B [Member] |  |
Balance, shares | 1,680,590 |
Balance, shares | 1,680,590 |
Class B [Member] | Common Stock Shares Outstanding [Member] |  |
Balance | $ 17,000 | $ 17,000
Balance, shares | 1,680 | 1,680
Balance | $ 17,000 | $ 17,000
Balance, shares | 1,680 | 1,680

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