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Property And Equipment (Summary Of Investment And Development Property) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Investment and development property $ 25,198rdi_PropertyHeldForAndUnderDevelopment $ 26,124rdi_PropertyHeldForAndUnderDevelopment
Land [Member]    
Property, Plant and Equipment [Line Items]    
Investment and development property 22,998rdi_PropertyHeldForAndUnderDevelopment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember		 23,833rdi_PropertyHeldForAndUnderDevelopment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Construction-In-Progress (Including Capitalized Interest) [Member]    
Property, Plant and Equipment [Line Items]    
Investment and development property $ 2,200rdi_PropertyHeldForAndUnderDevelopment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= rdi_ConstructionInProgressIncludingCapitalizedInterestMember		 $ 2,291rdi_PropertyHeldForAndUnderDevelopment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= rdi_ConstructionInProgressIncludingCapitalizedInterestMember