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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
oz
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
oz
Jun. 30, 2016
USD ($)
oz
Dec. 31, 2016
USD ($)
oz
Bullion [Line Items]          
Opening balance (in Ounces) | oz     4,889,808.5 3,426,930.6 3,426,930.6
Creations (in Ounces) | oz     877,497.5   1,981,707.3
Redemptions (in Ounces) | oz     (54,878.1)   (496,777.6)
Transfers of Bullion to pay expenses (in Ounces) | oz     (15,562.2)   (22,051.8)
Closing balance (in Ounces) | oz 5,696,865.7   5,696,865.7   4,889,808.5
Opening balance     $ 258,735 $ 161,846 $ 161,846
Creations     49,586   116,457
Redemptions     (3,145)   (24,619)
Realized gain / (loss) on Bullion distributed for the redemption of Shares $ 0 $ 0 51 (2,721) (2,722)
Transfers of Bullion to pay expenses     (874)   (1,233)
Realized (loss) / gain on Bullion transferred to pay expenses 5 1 (5) (28) 6
Change in unrealized gain on investment in Bullion (8,153) $ 17,105 16,068 $ 40,444 9,000
Closing balance $ 320,416   $ 320,416   $ 258,735
Gold [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     128,679.3 90,182.5 90,182.5
Creations (in Ounces) | oz     23,092.0   52,150.2
Redemptions (in Ounces) | oz     (1,444.2)   (13,073.1)
Transfers of Bullion to pay expenses (in Ounces) | oz     (409.5)   (580.3)
Closing balance (in Ounces) | oz 149,917.6   149,917.6   128,679.3
Opening balance     $ 149,152 $ 95,796 $ 95,796
Creations     28,363   67,230
Redemptions     (1,786)   (14,773)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     33   (544)
Transfers of Bullion to pay expenses     (503)   (722)
Realized (loss) / gain on Bullion transferred to pay expenses     5   31
Change in unrealized gain on investment in Bullion     10,971   2,134
Closing balance $ 186,235   $ 186,235   $ 149,152
Silver [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     4,718,236.5 3,306,687.6 3,306,687.6
Creations (in Ounces) | oz     846,708.2   1,912,173.7
Redemptions (in Ounces) | oz     (52,952.5)   (479,346.8)
Transfers of Bullion to pay expenses (in Ounces) | oz     (15,016.2)   (21,278.0)
Closing balance (in Ounces) | oz 5,496,976.0   5,496,976.0   4,718,236.5
Opening balance     $ 76,624 $ 45,699 $ 45,699
Creations     14,666   35,223
Redemptions     (938)   (6,974)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     10   (1,195)
Transfers of Bullion to pay expenses     (256)   (364)
Realized (loss) / gain on Bullion transferred to pay expenses     (8)   (4)
Change in unrealized gain on investment in Bullion     437   4,239
Closing balance $ 90,535   $ 90,535   $ 76,624
Platinum [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     17,157.1 12,024.2 12,024.2
Creations (in Ounces) | oz     3,078.9   6,953.4
Redemptions (in Ounces) | oz     (192.6)   (1,743.1)
Transfers of Bullion to pay expenses (in Ounces) | oz     (54.6)   (77.4)
Closing balance (in Ounces) | oz 19,988.8   19,988.8   17,157.1
Opening balance     $ 15,562 $ 10,485 $ 10,485
Creations     2,954   7,221
Redemptions     (197)   (1,522)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     (20)   (522)
Transfers of Bullion to pay expenses     (50)   (76)
Realized (loss) / gain on Bullion transferred to pay expenses     (9)   (13)
Change in unrealized gain on investment in Bullion     190   (11)
Closing balance $ 18,430   $ 18,430   $ 15,562
Palladium [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     25,735.6 18,036.3 18,036.3
Creations (in Ounces) | oz     4,618.4   10,430.0
Redemptions (in Ounces) | oz     (288.8)   (2,614.6)
Transfers of Bullion to pay expenses (in Ounces) | oz     (81.9)   (116.1)
Closing balance (in Ounces) | oz 29,983.3   29,983.3   25,735.6
Opening balance     $ 17,397 $ 9,866 $ 9,866
Creations     3,603   6,783
Redemptions     (224)   (1,350)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     28   (461)
Transfers of Bullion to pay expenses     (65)   (71)
Realized (loss) / gain on Bullion transferred to pay expenses     7   (8)
Change in unrealized gain on investment in Bullion     4,470   2,638
Closing balance $ 25,216   $ 25,216   $ 17,397