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Accumulated Other Comprehensive Income/(Loss) (Reconciliation Of Amounts Contained In Accumulated Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Accumulated other comprehensive income  
Beginning of period $ 11vgz_AccumulatedOtherComprehensiveIncomeLoss
Other comprehensive gain/(loss) due to change in fair market value of marketable securities during period before reclassifications (12)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsAndTax
Reclassifications due to realization of gain/loss on sale of marketable securities (12)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax [1]
End of period (13)vgz_AccumulatedOtherComprehensiveIncomeLoss
Accumulated other comprehensive income, net of tax  
Beginning of period 10vgz_AccumulatedOtherComprehensiveIncomeNetOfTax
Accumulated other comprehensive income, net of tax (10)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeReclassificationAdjustmentsNetOfTax
Accumulated other comprehensive income, net of tax due to realization of a gain (10)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax [1]
End of period $ (10)vgz_AccumulatedOtherComprehensiveIncomeNetOfTax
[1] Reclassified to gain/(loss) on sale of marketable securities on the Condensed Consolidated Statement of Income/(Loss) and Comprehensive Income/(Loss).