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Summary Of Significant Accounting Policies (Narrative) (Details) | 1 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  |  |  |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  |  |  |
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May 31, 2012 USD ($) | Dec. 31, 2014 USD ($) segment | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 Non Income Producing Properties [Member] USD ($) | Dec. 31, 2013 Non Income Producing Properties [Member] USD ($) | Dec. 31, 2012 Non Income Producing Properties [Member] USD ($) | Dec. 31, 2014 Australia Country Cinemas [Member] | Dec. 31, 2014 Sutton Hill Properties [Member] | Dec. 31, 2014 Shadow View Land And Farming LLC [Member] acre | Dec. 31, 2014 205-209 East 57th Street Associates, LLC [Member] | Dec. 31, 2014 Mt. Gravatt [Member] | Dec. 31, 2014 Rialto Distribution [Member] USD ($) | Dec. 31, 2014 Rialto Distribution [Member] NZD | Dec. 31, 2013 Rialto Distribution [Member] USD ($) | Dec. 31, 2013 Rialto Distribution [Member] NZD | Dec. 31, 2014 Rialto Cinemas [Member] | Dec. 31, 2014 NAB Australian Corporate Term Loan And Revolver [Member] AUD | Dec. 31, 2014 US Cinema 1, 2, 3 Term Loan [Member] USD ($) | Jun. 25, 2014 US Cinema 1, 2, 3 Term Loan [Member] USD ($) | Dec. 31, 2013 US Cinema 1, 2, 3 Term Loan [Member] USD ($) | May 29, 2013 Minetta and Orpheum Theatres Loan [Member] USD ($) | Dec. 31, 2014 Minetta and Orpheum Theatres Loan [Member] USD ($) | Dec. 31, 2013 Minetta and Orpheum Theatres Loan [Member] USD ($) | Oct. 30, 2012 US GE Capital Term Loan [Member] USD ($) | Oct. 31, 2012 US Bank Of America Revolver [Member] | Dec. 31, 2014 US Bank Of America Revolver [Member] USD ($) | Nov. 28, 2014 US Bank Of America Revolver [Member] USD ($) | Nov. 27, 2014 US Bank Of America Revolver [Member] USD ($) | Dec. 31, 2013 US Bank Of America Revolver [Member] USD ($) | Mar. 25, 2013 US Bank Of America Revolver [Member] USD ($) | Mar. 24, 2013 US Bank Of America Revolver [Member] USD ($) | Oct. 31, 2012 US Bank Of America Revolver [Member] USD ($) | Dec. 31, 2014 US Bank Of America Line Of Credit [Member] USD ($) | Mar. 25, 2013 US Bank Of America Line Of Credit [Member] USD ($) | Mar. 24, 2013 US Bank Of America Line Of Credit [Member] USD ($) | Oct. 30, 2012 US Bank Of America Line Of Credit [Member] USD ($) | Dec. 31, 2014 New Zealand Corporate Credit Facility [Member] USD ($) | Dec. 31, 2014 New Zealand Corporate Credit Facility [Member] NZD | Dec. 31, 2013 New Zealand Corporate Credit Facility [Member] USD ($) | Dec. 31, 2014 NAB Australian Corporate Term Loan And Revolver Tier One Two Three [Member] | Dec. 31, 2014 United States [Member] USD ($) | Dec. 31, 2014 United States [Member] US Bank Of America Revolver [Member] USD ($) | Dec. 31, 2014 Australia [Member] USD ($) | Dec. 31, 2014 New Zealand [Member] USD ($) | Dec. 31, 2014 Class A [Member] USD ($) | Dec. 31, 2013 Class A [Member] USD ($) | Dec. 31, 2012 Class A [Member] USD ($) | Dec. 31, 2011 Class A [Member] USD ($) | Dec. 31, 2014 Class B [Member] USD ($) | Dec. 31, 2013 Class B [Member] USD ($) | Dec. 31, 2012 Class B [Member] USD ($) | Dec. 31, 2011 Class B [Member] USD ($) | Dec. 31, 2014 Minimum [Member] | May 29, 2013 Minimum [Member] Minetta and Orpheum Theatres Loan [Member] | Oct. 31, 2012 Minimum [Member] US Bank Of America Revolver [Member] | Dec. 31, 2014 Minimum [Member] US Bank Of America Revolver [Member] | Dec. 31, 2014 Maximum [Member] | May 29, 2013 Maximum [Member] Minetta and Orpheum Theatres Loan [Member] | Oct. 31, 2012 Maximum [Member] US Bank Of America Revolver [Member] | Dec. 31, 2014 Maximum [Member] US Bank Of America Revolver [Member] | Dec. 31, 2014 Australian Dollar [Member] | Dec. 31, 2013 Australian Dollar [Member] | Dec. 31, 2014 New Zealand Dollar [Member] | Dec. 31, 2013 New Zealand Dollar [Member]
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in consolidated entity |  |  |  |  |  |  |  | 75.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rdi_AustraliaCountryCinemasMember | 75.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rdi_SuttonHillPropertiesMember | 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = rdi_ShadowViewLandAndFarmingLlcMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of property |  |  |  |  |  |  |  |  |  | 202 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = rdi_ShadowViewLandAndFarmingLlcMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in equity method investment |  |  |  |  |  |  |  |  |  |  | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_TwoZeroFiveTwoZeroNineEastFiftySeventhStreetAssociatesLlcMember | 33.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_MtGravattCinemaMember | 33.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 33.30%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoCinemasMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 01, 2016 |  |  |  | Jun. 01, 2018 |  |  | Oct. 31, 2017 | Dec. 01, 2019 |  |  |  |  |  |  | Oct. 31, 2017 |  |  |  | Mar. 31, 2015 | Mar. 31, 2015 |  | Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  | $ 592,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 760,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | $ 634,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 770,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note payable |  | 164,036,000 us-gaap_NotesPayable | 168,460,000 us-gaap_NotesPayable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_UnitedStateCinemasOneTwoThreeTermLoanMember |  | 15,000,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_UnitedStateCinemasOneTwoThreeTermLoanMember | 7,500,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_MinettaAndOrpheumTheatresLoanMember | 7,500,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_MinettaAndOrpheumTheatresLoanMember | 7,500,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_MinettaAndOrpheumTheatresLoanMember |  |  | 29,750,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember |  |  | 31,500,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember |  |  |  |  |  |  |  | 21,829,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember | 28,000,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember | 23,041,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.35%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_NabAustralianCorporateTermLoanAndRevolverMember | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_UnitedStateCinemasOneTwoThreeTermLoanMember |  |  | 2.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_MinettaAndOrpheumTheatresLoanMember |  |  |  |  |  |  |  |  |  |  |  | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaLineOfCreditMember |  |  |  | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_MinettaAndOrpheumTheatresLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | 4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_MinettaAndOrpheumTheatresLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Line of credit facility, previous borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 rdi_LineOfCreditFacilityPreviousBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaLineOfCreditMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 2,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 1,600,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember | 2,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rdi_RialtoDistributionMember |  | 61,300,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_NabAustralianCorporateTermLoanAndRevolverMember | 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStateCinemasOneTwoThreeTermLoanMember | 15,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStateCinemasOneTwoThreeTermLoanMember |  |  |  |  | 27,700,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesGeCapitalTermLoanMember |  |  | 55,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember | 35,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember |  | 35,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember | 30,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember | 30,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember | 5,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaLineOfCreditMember | 5,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaLineOfCreditMember |  | 3,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaLineOfCreditMember | 32,800,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember | 40,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, increase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 us-gaap_LineOfCreditFacilityIncreaseDecreaseOtherNet / us-gaap_DebtInstrumentAxis = rdi_UnitedStateCinemasOneTwoThreeTermLoanMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash position |  | 50,200,000 us-gaap_CashCashEquivalentsAndShortTermInvestments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,400,000 us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_StatementGeographicalAxis = country_US |  | 12,100,000 us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_StatementGeographicalAxis = country_AU | 7,700,000 us-gaap_CashCashEquivalentsAndShortTermInvestments / us-gaap_StatementGeographicalAxis = country_NZ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, funds available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStateCinemasOneTwoThreeTermLoanMember |  |  |  |  |  |  |  | 25,300,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember |  |  |  |  |  |  | 5,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaLineOfCreditMember |  |  |  | 9,400,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_NewZealandCorporateCreditFacilityMember |  |  |  |  | 5,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = rdi_UnitedStatesBankOfAmericaRevolverMember / us-gaap_StatementGeographicalAxis = country_US |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposit interest rate | 48.00%invest_InvestmentInterestRate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time deposits | 8,000,000 us-gaap_TimeDepositsAtCarryingValue | 0 us-gaap_TimeDepositsAtCarryingValue | 1,100,000 us-gaap_TimeDepositsAtCarryingValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative unrealized gain |  | 10,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized losses |  | 1,000 us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax | 0 us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax | 2,000 us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted cash |  | 1,433,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 782,000 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of segments |  | 2 us-gaap_NumberOfReportableSegments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrestricted cash |  | 26,200,000 rdi_DebtCovenantsUnrestrictedCashAndCashEquivalentsAndShortTermInvestments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment losses |  |  |  | 1,463,000 us-gaap_AssetImpairmentCharges | 0 us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rdi_NonIncomeproducingPropertiesMember | 0 us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rdi_NonIncomeproducingPropertiesMember | 1,500,000 us-gaap_AssetImpairmentCharges / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rdi_NonIncomeproducingPropertiesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expense |  | 2,100,000 us-gaap_AdvertisingExpense | 3,400,000 us-gaap_AdvertisingExpense | 3,800,000 us-gaap_AdvertisingExpense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains/(losses) on the settlement of litigation |  | (83,000)us-gaap_GainLossRelatedToLitigationSettlement | (285,000)us-gaap_GainLossRelatedToLitigationSettlement | (194,000)us-gaap_GainLossRelatedToLitigationSettlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on cinema acquisition and settlement |  |  | $ 1,359,000 rdi_GainLossOnAcquisitionAndOrSettlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency exchange rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.8173 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_CurrencyAxis = rdi_UDMember | 0.8929 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_CurrencyAxis = rdi_UDMember | 0.7796 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_CurrencyAxis = rdi_NZDMember | 0.8229 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_CurrencyAxis = rdi_NZDMember
Options issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 568,250 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 709,850 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 672,350 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 622,350 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 185,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 185,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 185,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 185,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  |  |  |  |  |  |  |  |
Options issued, weighted average exercise price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6.88 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 6.66 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 6.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 5.65 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 9.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 9.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 9.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 9.90 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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- Definition Gain (Loss) on Acquisition And Or Settlement + References No definition available. + Details
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- Definition Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Area of a real estate property. + References No definition available. + Details
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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Net increase or decrease in the carrying amount of the credit facility for the period for reasons other than accrued, but unpaid interest, additional borrowings, repayments, and forgiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_TimeDepositsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant