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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, 2016
USD ($)
oz
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
oz
Jun. 30, 2015
USD ($)
oz
Dec. 31, 2015
USD ($)
oz
Bullion [Line Items]          
Opening balance (in Ounces) | oz     3,426,930.6 4,225,571.5 4,225,571.5
Creations (in Ounces) | oz     496,167.7   1,162,385.4
Redemptions (in Ounces) | oz     (441,790.2)   (1,943,511.8)
Transfers of Bullion to pay expenses (in Ounces) | oz     (9,568.9)   (17,514.5)
Closing balance (in Ounces) | oz 3,471,739.2   3,471,739.2   3,426,930.6
Opening balance     $ 161,846 $ 234,158 $ 234,158
Creations     27,560   58,236
Redemptions     (21,503)   (111,755)
Realized gain / (loss) on Bullion transferred for redemptions $ 0 $ (352) (2,721) 1,243 391
Transfers of Bullion to pay expenses     (496)   (943)
Realized gain / (loss) on Bullion transferred to pay expenses 1 (8) (28) (11) (55)
Change in unrealized gain on investment in Bullion 17,105 $ (4,298) 40,444 $ (2,365) (18,186)
Closing balance $ 205,102   $ 205,102   $ 161,846
Gold [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     90,182.5 111,199.3 111,199.3
Creations (in Ounces) | oz     13,057.0   30,589.1
Redemptions (in Ounces) | oz     (11,626.1)   (51,145.0)
Transfers of Bullion to pay expenses (in Ounces) | oz     (251.8)   (460.9)
Closing balance (in Ounces) | oz 91,361.6   91,361.6   90,182.5
Opening balance     $ 95,796 $ 133,356 $ 133,356
Creations     16,371   33,895
Redemptions     (12,959)   (63,671)
Realized gain / (loss) on Bullion transferred for redemptions     (593)   2,404
Transfers of Bullion to pay expenses     (298)   (540)
Realized gain / (loss) on Bullion transferred to pay expenses     4   (11)
Change in unrealized gain on investment in Bullion     22,345   (9,637)
Closing balance $ 120,666   $ 120,666   $ 95,796
Silver [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     3,306,687.6 4,077,306.0 4,077,306.0
Creations (in Ounces) | oz     478,758.4   1,121,600.0
Redemptions (in Ounces) | oz     (426,288.8)   (1,875,318.5)
Transfers of Bullion to pay expenses (in Ounces) | oz     (9,233.1)   (16,899.9)
Closing balance (in Ounces) | oz 3,349,924.1   3,349,924.1   3,306,687.6
Opening balance     $ 45,699 $ 65,115 $ 65,115
Creations     7,983   16,659
Redemptions     (6,047)   (32,014)
Realized gain / (loss) on Bullion transferred for redemptions     (1,186)   (1,697)
Transfers of Bullion to pay expenses     (139)   (269)
Realized gain / (loss) on Bullion transferred to pay expenses     (17)   (32)
Change in unrealized gain on investment in Bullion     15,212   (2,063)
Closing balance $ 61,505   $ 61,505   $ 45,699
Platinum [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     12,024.2 14,826.5 14,826.5
Creations (in Ounces) | oz     1,740.9   4,078.5
Redemptions (in Ounces) | oz     (1,550.1)   (6,819.3)
Transfers of Bullion to pay expenses (in Ounces) | oz     (33.6)   (61.5)
Closing balance (in Ounces) | oz 12,181.4   12,181.4   12,024.2
Opening balance     $ 10,485 $ 17,940 $ 17,940
Creations     1,735   3,909
Redemptions     (1,337)   (8,176)
Realized gain / (loss) on Bullion transferred for redemptions     (486)   (611)
Transfers of Bullion to pay expenses     (32)   (67)
Realized gain / (loss) on Bullion transferred to pay expenses     (8)   (11)
Change in unrealized gain on investment in Bullion     1,812   (2,499)
Closing balance $ 12,169   $ 12,169   $ 10,485
Palladium [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     18,036.3 22,239.7 22,239.7
Creations (in Ounces) | oz     2,611.4   6,117.8
Redemptions (in Ounces) | oz     (2,325.2)   (10,229.0)
Transfers of Bullion to pay expenses (in Ounces) | oz     (50.4)   (92.2)
Closing balance (in Ounces) | oz 18,272.1   18,272.1   18,036.3
Opening balance     $ 9,866 $ 17,747 $ 17,747
Creations     1,471   3,773
Redemptions     (1,160)   (7,894)
Realized gain / (loss) on Bullion transferred for redemptions     (456)   295
Transfers of Bullion to pay expenses     (27)   (67)
Realized gain / (loss) on Bullion transferred to pay expenses     (7)   (1)
Change in unrealized gain on investment in Bullion     1,075   (3,987)
Closing balance $ 10,762   $ 10,762   $ 9,866