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Pension And Other Liabilities (Schedule Of Reconciliation Of The Lease Make-Good Provision) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Pension And Other Liabilities [Abstract] |  |
Lease make-good provision, Beginning balance | $ 6,667 | $ 5,614
Liabilities incurred during the year | 62 | 902
Liabilities settled during the year |  | (206)
Accretion expense | 291 | 352
Effect of changes in foreign currency | 388 | 5
Lease make-good provision, Ending balance | $ 7,408 | $ 6,667

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- Definition Lease Make-good Provision + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lease Make-Good Provision, Accretion Expense + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Lease Make-Good Provision, Effects Of Changes In Foreign Currency + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
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- Definition Lease Make-Good Provision, Liabilities Incurred + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Lease Make-Good Provision, Liabilities Settled + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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