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Pension Liabilities (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Unrecognized prior service cost   $ 627,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax  
Interest cost 255,000us-gaap_DefinedBenefitPlanInterestCost 202,000us-gaap_DefinedBenefitPlanInterestCost  
Amortization of prior service costs 254,000us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit 304,000us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit  
Amortization of net gain 426,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 356,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses  
Accumulated unrecognized prior service cost 3,055,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTax 3,793,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTax  
Pension expenses 738,000us-gaap_PensionExpense 660,000us-gaap_PensionExpense 304,000us-gaap_PensionExpense
Discount rate 4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate  
Rate of compensation increase 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease  
Actuarial loss (gain) 58,000us-gaap_DefinedBenefitPlanActuarialGainLoss (1,252,000)us-gaap_DefinedBenefitPlanActuarialGainLoss  
Benefit obligation 7,595,000us-gaap_DefinedBenefitPlanBenefitObligation 7,398,000us-gaap_DefinedBenefitPlanBenefitObligation 5,944,000us-gaap_DefinedBenefitPlanBenefitObligation
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease  
Prior service costs   627,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax  
Amortization of net gain (426,000)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses (356,000)us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses  
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax 3,055,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTax 3,793,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossAfterTax  
Pension Expense 738,000us-gaap_PensionExpense 660,000us-gaap_PensionExpense 304,000us-gaap_PensionExpense
Supplemental Executive Retirement Plans [Member] | Chief Executive Officer [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of monthly salary paid as retirement benefit 40.00%rdi_SupplementalRetirementBenefitsPercentageOfMonthlySalaryPaid
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Measurement period for monthly salary based payment 36 months    
Monthly payment amount after retirement 25,000rdi_SupplementalRetirementBenefitsMonthlyPaymentAmount
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Period of guaranteed monthly payments 180 months    
Defined Benefit Plan Guaranteed Period Amount 10,200,000rdi_DefinedBenefitPlanGuaranteedPeriodAmount
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Defined Benefit Plan Accrual Reduced Amount 58,000rdi_DefinedBenefitPlanAccrualReducedAmount
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Defined Benefit Plan Earnings Calculated 56,944rdi_DefinedBenefitPlanEarningsCalculated
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Balance of liability 7,500,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Estimated amortization of net loss next fiscal year 0rdi_DefinedBenefitPlanEstimatedAmortizationOnNetGainLossNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Estimated amortization of prior service cost next fiscal year 207,000rdi_DefinedBenefitPlanEstimatedAmortizationOnPriorServiceCostNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Discount rate 4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Actuarial loss (gain) 3,100,000us-gaap_DefinedBenefitPlanActuarialGainLoss
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Benefit obligation 7,600,000us-gaap_DefinedBenefitPlanBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember		    
Pension and Other Postretirement Defined Benefit Plans, Liabilities $ 7,500,000us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember