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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
oz
Mar. 31, 2015
USD ($)
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 55,240.2   1,162,385.4
Redemptions (in Ounces) | oz (441,790.2)   (1,943,511.8)
Transfers of Bullion to pay expenses (in Ounces) | oz (4,864.4)   (17,514.5)
Closing balance (in Ounces) | oz 3,035,516.2   3,426,930.6
Opening balance $ 161,846 $ 234,158 $ 234,158
Creations 2,652   58,236
Redemptions (21,503)   (111,755)
Realized gain / (loss) on Bullion transferred for redemptions (2,721) 1,595 391
Transfers of Bullion to pay expenses (238)   (943)
Realized loss on Bullion transferred to pay expenses (28) (3) (55)
Change in unrealized gain on investment in Bullion 23,340 $ 1,933 (18,186)
Closing balance $ 163,348   $ 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 1,453.7   30,589.1
Redemptions (in Ounces) | oz (11,626.1)   (51,145.0)
Transfers of Bullion to pay expenses (in Ounces) | oz (128.0)   (460.9)
Closing balance (in Ounces) | oz 79,882.1   90,182.5
Opening balance $ 95,796 $ 133,356 $ 133,356
Creations 1,586   33,895
Redemptions (12,959)   (63,671)
Realized gain / (loss) on Bullion transferred for redemptions (593)   2,404
Transfers of Bullion to pay expenses (143)   (540)
Realized loss on Bullion transferred to pay expenses (6)   (11)
Change in unrealized gain on investment in Bullion 15,133   (9,637)
Closing balance $ 98,814   $ 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 53,302.0   1,121,600.0
Redemptions (in Ounces) | oz (426,288.8)   (1,875,318.5)
Transfers of Bullion to pay expenses (in Ounces) | oz (4,693.7)   (16,899.9)
Closing balance (in Ounces) | oz 2,929,007.1   3,306,687.6
Opening balance $ 45,699 $ 65,115 $ 65,115
Creations 746   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 (67)   (269)
Realized loss on Bullion transferred to pay expenses (12)   (32)
Change in unrealized gain on investment in Bullion 5,915   (2,063)
Closing balance $ 45,048   $ 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 193.8   4,078.5
Redemptions (in Ounces) | oz (1,550.1)   (6,819.3)
Transfers of Bullion to pay expenses (in Ounces) | oz (17.1)   (61.5)
Closing balance (in Ounces) | oz 10,650.8   12,024.2
Opening balance $ 10,485 $ 17,940 $ 17,940
Creations 169   3,909
Redemptions (1,338)   (8,176)
Realized gain / (loss) on Bullion transferred for redemptions (486)   (611)
Transfers of Bullion to pay expenses (15)   (67)
Realized loss on Bullion transferred to pay expenses (5)   (11)
Change in unrealized gain on investment in Bullion 1,585   (2,499)
Closing balance $ 10,395   $ 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 290.7   6,117.8
Redemptions (in Ounces) | oz (2,325.2)   (10,229.0)
Transfers of Bullion to pay expenses (in Ounces) | oz (25.6)   (92.2)
Closing balance (in Ounces) | oz 15,976.2   18,036.3
Opening balance $ 9,866 $ 17,747 $ 17,747
Creations 151   3,773
Redemptions (1,159)   (7,894)
Realized gain / (loss) on Bullion transferred for redemptions (456)   295
Transfers of Bullion to pay expenses (13)   (67)
Realized loss on Bullion transferred to pay expenses (5)   (1)
Change in unrealized gain on investment in Bullion 707   (3,987)
Closing balance $ 9,091   $ 9,866