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Derivative Instruments (Set Forth Terms Of Interest Rate Swap And Cap Derivative Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivative [Line Items] |  |
Notional amount | $ 59,913 | $ 59,913
Other assets | 1 | 1
Other current liabilities | 394 | 156
Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Notional amount | 52,413 | 52,413
Other current liabilities | 394 | 156
Interest Rate Cap [Member] |  |
Derivative [Line Items] |  |
Notional amount | 7,500 | 7,500
Other assets | $ 1 | $ 1

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Derivative Other Assets + References No definition available. + Details
Name: | rdi_DerivativeOtherAssets
Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Derivative Other Liabilities Current + References No definition available. + Details
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Namespace Prefix: | rdi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |