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Income Tax (Deferred Tax Assets/Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components of Deferred Tax Assets and Liabilities [Abstract]      
Excess tax basis over book basis of property, plant, and equipment $ 7,893us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment $ 7,496us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment $ 8,001us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, Marketable securities 798us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 661us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 62us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Operating loss carryforwards 35,001us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 36,367us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 37,635us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capital loss carryforwards 10,212us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 5,474us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 2,630us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Other 2,891us-gaap_DeferredTaxAssetsOther 1,541us-gaap_DeferredTaxAssetsOther 3,219us-gaap_DeferredTaxAssetsOther
Unrealized foreign exchange on loans   79vgz_UnrealizedForeignExchangeOnLoans 217vgz_UnrealizedForeignExchangeOnLoans
Deferred Tax Assets, Gross, Total 56,795us-gaap_DeferredTaxAssetsGross 51,618us-gaap_DeferredTaxAssetsGross 51,764us-gaap_DeferredTaxAssetsGross
Valuation allowance for future tax assets (54,397)us-gaap_DeferredTaxAssetsValuationAllowance (43,955)us-gaap_DeferredTaxAssetsValuationAllowance (41,817)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net 2,398us-gaap_DeferredTaxAssetsNet 7,663us-gaap_DeferredTaxAssetsNet 9,947us-gaap_DeferredTaxAssetsNet
Other investments 1,916us-gaap_DeferredTaxLiabilitiesInvestments 7,181us-gaap_DeferredTaxLiabilitiesInvestments 24,839us-gaap_DeferredTaxLiabilitiesInvestments
Amayapampa disposal consideration 482vgz_AmayapampaDisposalConsideration 482vgz_AmayapampaDisposalConsideration 482vgz_AmayapampaDisposalConsideration
Deferred Income Tax Liabilities, Gross 2,398us-gaap_DeferredIncomeTaxLiabilities 7,663us-gaap_DeferredIncomeTaxLiabilities 25,321us-gaap_DeferredIncomeTaxLiabilities
Total Deferred Taxes     $ (15,374)us-gaap_DeferredTaxLiabilities