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Borrowings (Bank Of America Credit Facility) (Narrative) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 03, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Contractual facility |  | $ 252,929 | $ 271,732
Bank Of America Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Contractual facility | $ 55,000 | $ 55,000 | $ 55,000
Reduced leverage ratio | 0.25% |  |
Earliest period subjected to repayment of borrowings |  | 18 months |

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

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- Definition Debt Instrument Decreased Consolidated Leverage Ratio + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Debt Instrument, Minimum Period Subjected To Repayment Of Borrowings + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:durationItemType
Balance Type: | na
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

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- Details
Name: | us-gaap_DebtInstrumentAxis=rdi_UnitedStatesBankOfAmericaCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |