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Stock-Based Compensation And Employee Stock Option Plan (Schedule Of Stock Options Outstanding And Exercisable) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Exercise Price of Options Outstanding, Granted $ 8.56us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice $ 6.19us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice    
Common Stock Exercisable Options, Outstanding Ending balance 348,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber      
Class A [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock Options Outstanding, Beginning balance 709,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
672,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
622,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Stock Options Outstanding, Granted 80,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
175,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
206,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Stock Options Outstanding, Exercised (157,600)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
(137,500)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
(136,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Stock Options Outstanding, Expired (64,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  (20,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Stock Options Outstanding, Ending balance 568,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
709,850us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
672,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted Average Exercise Price of Options Outstanding, Beginning price $ 6.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 6.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 5.65us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted Average Exercise Price of Options Outstanding, No activity     $ 5.94rdi_SharebasedCompensationArrangementByShareBasedPaymentAwardOptionsNoActivityInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted Average Exercise Price of Options Outstanding, Granted $ 8.56us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 6.19us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
   
Weighted Average Exercise Price of Options Outstanding, Exercised $ 6.21us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 4.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 4.68us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted Average Exercise Price of Options Outstanding, Expired $ 6.83us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
  $ 3.75us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted Average Exercise Price of Options Outstanding, Ending price $ 6.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 6.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 6.24us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Stock Exercisable Options, Outstanding Beginning balance 490,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
546,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
544,383us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Common Stock Exercisable Options, Outstanding Ending balance   490,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
546,350us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted Average Price of Exercisable Options, Outstanding Beginning balance $ 6.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 6.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 5.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Weighted Average Price of Exercisable Options, Outstanding Ending balance $ 6.82us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 6.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 6.26us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Class B [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common Stock Options Outstanding, Beginning balance       185,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock Options Outstanding, Ending balance 185,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
185,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
185,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
185,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Weighted Average Exercise Price of Options Outstanding, Beginning price       $ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Weighted Average Exercise Price of Options Outstanding, Ending price $ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock Exercisable Options, Outstanding Beginning balance       167,550us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Common Stock Exercisable Options, Outstanding Ending balance   185,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
185,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
167,550us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Weighted Average Price of Exercisable Options, Outstanding Beginning balance       $ 10.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Weighted Average Price of Exercisable Options, Outstanding Ending balance $ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 9.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 10.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember