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