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Significant Accounting Policies (Quantitative Effect Of Adoption Of Investment Company Accounting) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2014 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2013
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Value at December 31, 2013 at lower of cost or market value |  |  | $ 234,158 |  |
Value at January 1, 2014 at fair value |  |  | 234,158 | $ 161,846 | $ 260,476
Gain / (loss) as a result of change in accounting principle | [1] |  | 554 |  |
Gold [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Value at December 31, 2013 at lower of cost or market value |  |  | 133,356 |  | 139,729
Value at January 1, 2014 at fair value |  | $ 139,729 | 133,356 | 95,796 | 139,729
Silver [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Value at December 31, 2013 at lower of cost or market value |  |  | 65,115 |  | 83,152
Value at January 1, 2014 at fair value |  | 83,152 | 65,115 | 45,699 | 83,152
Platinum [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Value at December 31, 2013 at lower of cost or market value |  |  | 17,940 |  | 21,057
Value at January 1, 2014 at fair value |  | 21,057 | 17,940 | 10,485 | 21,057
Palladium [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Value at December 31, 2013 at lower of cost or market value |  |  | 17,747 |  | 15,984
Value at January 1, 2014 at fair value |  | 16,538 | $ 17,747 | $ 9,866 | $ 16,538
Gain / (loss) as a result of change in accounting principle |  | $ 554 |  |  |
[1] | Effective January 1, 2014, the Trust has adopted the provisions of Topic 946. Refer to Note 2.1 for additional information.

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