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Fair Value Disclosures - Summary of valuation of financial instruments measured at fair value on recurring basis (Details) (Fair value on a recurring basis, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Quoted prices in active markets for identical assets (Level 1)
    
Assets:    
Trading securities      
Available-for-sale securities - equity securities 275us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 445us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Significant other observable inputs (Level 2)
    
Assets:    
Trading securities 16,491us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 13,963us-gaap_TradingSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Available-for-sale securities - equity securities      
Significant unobservable inputs (Level 3)
    
Assets:    
Trading securities      
Available-for-sale securities - equity securities