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Current Expected Credit Losses - Summary of Allowance For Credit Losses Related to Variable Consideration Receivables (Details) - Theatre Operators [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounts Receivable Allowance For Credit Loss [Line Items]
Beginning balance	$ 2,028	$ 863	$ 1,887
Current period (reversal) provision, net	(933)	790	(771)	$ 1,653
Foreign Exchange	(1)	6	(22)	6
Ending balance	$ 1,094	$ 1,659	$ 1,094	$ 1,659