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Borrowings (Bank Of America Line Of Credit) (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Contractual facility | $ 240,626 | $ 248,948

X
- Definition Debt Instrument Contractual Facility Borrowing Capacity + References No definition available. + Details
Name: | rdi_DebtInstrumentContractualFacilityBorrowingCapacity
Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration