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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
oz
Mar. 31, 2018
USD ($)
oz
Bullion [Line Items]    
Opening balance (in Ounces) | oz 6,188,465.8 6,116,596.4
Creations (in Ounces) | oz 108,466.2 490,964.7
Redemptions (in Ounces) | oz (325,251.9) (163,632.6)
Transfers of Bullion to pay expenses (in Ounces) | oz (9,176.3) (9,208.3)
Closing balance (in Ounces) | oz 5,962,503.8 6,434,720.2
Opening balance $ 359,447 $ 362,116
Creations 6,452 29,443
Redemptions (19,439) (9,785)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 954 484
Transfers of Bullion to pay expenses (543) (553)
Realized gain / (loss) on Bullion transferred to pay expenses 21 30
Change in unrealized gain / (loss) on investment in Bullion 4,644 (2,495)
Closing balance $ 351,536 $ 379,240
Gold [Member]    
Bullion [Line Items]    
Opening balance (in Ounces) | oz 162,854.5 160,963.2
Creations (in Ounces) | oz 2,854.4 12,920.1
Redemptions (in Ounces) | oz (8,559.3) (4,306.1)
Transfers of Bullion to pay expenses (in Ounces) | oz (241.5) (242.3)
Closing balance (in Ounces) | oz 156,908.1 169,334.9
Opening balance $ 208,722 $ 208,689
Creations 3,714 17,145
Redemptions (11,152) (5,754)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 595 462
Transfers of Bullion to pay expenses (313) (321)
Realized gain / (loss) on Bullion transferred to pay expenses 15 24
Change in unrealized gain / (loss) on investment in Bullion 1,677 3,929
Closing balance $ 203,258 $ 224,174
Silver [Member]    
Bullion [Line Items]    
Opening balance (in Ounces) | oz 5,971,327.0 5,901,979.3
Creations (in Ounces) | oz 104,660.3 473,737.9
Redemptions (in Ounces) | oz (313,839.5) (157,891.2)
Transfers of Bullion to pay expenses (in Ounces) | oz (8,854.3) (8,885.2)
Closing balance (in Ounces) | oz 5,753,293.5 6,208,940.8
Opening balance $ 92,347 $ 99,537
Creations 1,638 7,943
Redemptions (4,842) (2,618)
Realized gain / (loss) on Bullion distributed for the redemption of Shares (545) (139)
Transfers of Bullion to pay expenses (138) (150)
Realized gain / (loss) on Bullion transferred to pay expenses (14) (6)
Change in unrealized gain / (loss) on investment in Bullion (1,571) (3,485)
Closing balance $ 86,875 $ 101,082
Platinum [Member]    
Bullion [Line Items]    
Opening balance (in Ounces) | oz 21,713.7 21,461.5
Creations (in Ounces) | oz 380.6 1,722.7
Redemptions (in Ounces) | oz (1,141.2) (574.1)
Transfers of Bullion to pay expenses (in Ounces) | oz (32.2) (32.3)
Closing balance (in Ounces) | oz 20,920.9 22,577.8
Opening balance $ 17,241 $ 19,895
Creations 309 1,682
Redemptions (925) (558)
Realized gain / (loss) on Bullion distributed for the redemption of Shares (273) (63)
Transfers of Bullion to pay expenses (26) (31)
Realized gain / (loss) on Bullion transferred to pay expenses (8) (4)
Change in unrealized gain / (loss) on investment in Bullion 1,465 212
Closing balance $ 17,783 $ 21,133
Palladium [Member]    
Bullion [Line Items]    
Opening balance (in Ounces) | oz 32,570.6 32,192.4
Creations (in Ounces) | oz 570.9 2,584.0
Redemptions (in Ounces) | oz (1,711.9) (861.2)
Transfers of Bullion to pay expenses (in Ounces) | oz (48.3) (48.5)
Closing balance (in Ounces) | oz 31,381.3 33,866.7
Opening balance $ 41,137 $ 33,995
Creations 791 2,673
Redemptions (2,520) (855)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,177 224
Transfers of Bullion to pay expenses (66) (51)
Realized gain / (loss) on Bullion transferred to pay expenses 28 16
Change in unrealized gain / (loss) on investment in Bullion 3,073 (3,151)
Closing balance $ 43,620 $ 32,851