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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
oz
Mar. 31, 2016
USD ($)
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 439,068.4   1,981,707.3
Redemptions (in Ounces) | oz (54,878.1)   (496,777.6)
Transfers of Bullion to pay expenses (in Ounces) | oz (7,372.5)   (22,051.8)
Closing balance (in Ounces) | oz 5,266,626.3   4,889,808.5
Opening balance $ 258,735 $ 161,846 $ 161,846
Creations 24,353   116,457
Redemptions (3,145)   (24,619)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 51 (2,721) (2,722)
Transfers of Bullion to pay expenses (406)   (1,233)
Realized (loss) / gain on Bullion transferred to pay expenses (10) (28) 6
Change in unrealized gain on investment in Bullion 24,221 $ 23,340 9,000
Closing balance $ 303,799   $ 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 11,554.4   52,150.2
Redemptions (in Ounces) | oz (1,444.2)   (13,073.1)
Transfers of Bullion to pay expenses (in Ounces) | oz (194.0)   (580.3)
Closing balance (in Ounces) | oz 138,595.5   128,679.3
Opening balance $ 149,152 $ 95,796 $ 95,796
Creations 13,866   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 (232)   (722)
Realized (loss) / gain on Bullion transferred to pay expenses (4)   31
Change in unrealized gain on investment in Bullion 11,501   2,134
Closing balance $ 172,530   $ 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 423,662.5   1,912,173.7
Redemptions (in Ounces) | oz (52,952.5)   (479,346.8)
Transfers of Bullion to pay expenses (in Ounces) | oz (7,113.8)   (21,278.0)
Closing balance (in Ounces) | oz 5,081,832.7   4,718,236.5
Opening balance $ 76,624 $ 45,699 $ 45,699
Creations 7,247   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 (120)   (364)
Realized (loss) / gain on Bullion transferred to pay expenses (5)   (4)
Change in unrealized gain on investment in Bullion 8,960   4,239
Closing balance $ 91,778   $ 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 1,540.6   6,953.4
Redemptions (in Ounces) | oz (192.6)   (1,743.1)
Transfers of Bullion to pay expenses (in Ounces) | oz (25.9)   (77.4)
Closing balance (in Ounces) | oz 18,479.2   17,157.1
Opening balance $ 15,562 $ 10,485 $ 10,485
Creations 1,498   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 (25)   (76)
Realized (loss) / gain on Bullion transferred to pay expenses (3)   (13)
Change in unrealized gain on investment in Bullion 556   (11)
Closing balance $ 17,371   $ 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 2,310.9   10,430.0
Redemptions (in Ounces) | oz (288.8)   (2,614.6)
Transfers of Bullion to pay expenses (in Ounces) | oz (38.8)   (116.1)
Closing balance (in Ounces) | oz 27,718.9   25,735.6
Opening balance $ 17,397 $ 9,866 $ 9,866
Creations 1,742   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 (29)   (71)
Realized (loss) / gain on Bullion transferred to pay expenses 2   (8)
Change in unrealized gain on investment in Bullion 3,204   2,638
Closing balance $ 22,120   $ 17,397