XML 110 R92.htm IDEA: XBRL DOCUMENT
v3.20.2

Stock-Based Compensation And Stock Repurchases (Schedule Of Restricted Stock Units Issued And Vested) (Details) - Restricted Stock Units (RSUs) [Member] | 6 Months Ended
--- | ---
Jun. 30, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 582,712
Number of options, Vested | 224,117
Number of options, Forfeited | 6,126
Number of options, Unvested | 352,469
March 10, 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 62,528
Number of options, Vested | 62,262
Number of options, Forfeited | 266
April 11, 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 5,625
Number of options, Vested | 5,108
Number of options, Forfeited | 517
March 23, 2017 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 63,144
Number of options, Vested | 54,196
Number of options, Forfeited | 532
Number of options, Unvested | 8,416
August 29, 2017 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 7,394
Number of options, Vested | 5,546
Number of options, Unvested | 1,848
January 2, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 29,393
Number of options, Vested | 29,393
April 12, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 29,596
Number of options, Vested | 14,553
Number of options, Forfeited | 775
Number of options, Unvested | 14,268
April 13, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 14,669
Number of options, Vested | 7,336
Number of options, Unvested | 7,333
July 6, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 932
Number of options, Forfeited | 932
November 7, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 23,010
Number of options, Vested | 23,010
March 13, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 24,366
Number of options, Vested | 5,316
Number of options, Forfeited | 3,104
Number of options, Unvested | 15,946
March 14, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 23,327
Number of options, Vested | 5,832
Number of options, Unvested | 17,495
May 7, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 11,565
Number of options, Vested | 11,565
March 10, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 287,163
Number of options, Unvested | 287,163
Directors [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 129,796
Directors [Member] | March 10, 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 35,147
Directors [Member] | March 23, 2017 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 30,681
Directors [Member] | January 2, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 29,393
Directors [Member] | November 7, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 23,010
Directors [Member] | May 7, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 11,565
Management [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 452,916
Management [Member] | March 10, 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 27,381
Management [Member] | April 11, 2016 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 5,625
Management [Member] | March 23, 2017 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 32,463
Management [Member] | August 29, 2017 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 7,394
Management [Member] | April 12, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 29,596
Management [Member] | April 13, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 14,669
Management [Member] | July 6, 2018 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 932
Management [Member] | March 13, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 24,366
Management [Member] | March 14, 2019 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 23,327
Management [Member] | March 10, 2020 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of options, Grants | 287,163

X
- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Vested And Nonvested, Outstanding, Number + References No definition available. + Details
Name: | rdi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndNonvestedOutstandingNumber
Namespace Prefix: | rdi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Vested, Outstanding, Number + References No definition available. + Details
Name: | rdi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedOutstandingNumber
Namespace Prefix: | rdi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- 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_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheSixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheSevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheEightMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheNineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheTenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheElevenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheTwelveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VestingAxis=rdi_ShareBasedCompensationAwardTrancheThirteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_TitleOfIndividualAxis=srt_ManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |