Earnings Per Share (Computation Of Basic And Diluted Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income (loss) attributable to Reading International, Inc. common shareholders	$ (15,354)	$ 18,965
Weighted average number of common stock – basic	21,955,985	21,761,307
Weighted average dilutive impact of awards	544,673	408,961
Weighted average number of common stock – diluted	22,500,658	22,170,268
Basic earnings (loss) per share	$ (0.70)	$ 0.87
Diluted earnings (loss) per share	$ (0.70)	$ 0.86
Awards excluded from diluted earnings (loss) per share	544,673	514,341