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Schedule of Investments (oz, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Investment in Bullion (oz)	2,776,289.9us-gaap_InvestmentOwnedBalanceOtherMeasure	4,225,571.5us-gaap_InvestmentOwnedBalanceOtherMeasure
Cost	$ 159,154us-gaap_InvestmentOwnedAtCost	$ 242,403us-gaap_InvestmentOwnedAtCost
Fair Value	152,842us-gaap_InvestmentOwnedAtFairValue	234,158us-gaap_InvestmentOwnedAtFairValue
% of Net Assets	102.09%us-gaap_InvestmentOwnedPercentOfNetAssets	98.74%us-gaap_InvestmentOwnedPercentOfNetAssets
Gold [Member]
Investment Holdings [Line Items]
Investment in Bullion (oz)	73,060.4us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XAU	111,199.3us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XAU
Cost	87,541us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XAU	133,156us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XAU
Fair Value	86,723us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XAU	133,356us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XAU
% of Net Assets	57.93%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XAU	56.23%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XAU
Silver [Member]
Investment Holdings [Line Items]
Investment in Bullion (oz)	2,678,876.2us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XAG	4,077,306.0us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XAG
Cost	48,190us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XAG	73,612us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XAG
Fair Value	44,469us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XAG	65,115us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XAG
% of Net Assets	29.70%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XAG	27.46%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XAG
Platinum [Member]
Investment Holdings [Line Items]
Investment in Bullion (oz)	9,741.4us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XPT	14,826.5us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XPT
Cost	12,564us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPT	19,160us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPT
Fair Value	10,998us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XPT	17,940us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XPT
% of Net Assets	7.35%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XPT	7.56%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XPT
Palladium [Member]
Investment Holdings [Line Items]
Investment in Bullion (oz)	14,611.9us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XPD	22,239.7us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XPD
Cost	10,859us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPD	16,475us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPD
Fair Value	$ 10,652us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XPD	$ 17,747us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XPD
% of Net Assets	7.12%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XPD	7.48%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XPD

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