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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
oz
Mar. 31, 2019
USD ($)
oz
Bullion [Line Items]    
Opening balance (in Ounces) | oz 6,960,703.4 6,188,465.8
Creations (in Ounces) | oz 808,368.9 108,466.2
Redemptions (in Ounces) | oz (323,243.6) (325,251.9)
Transfers of Bullion to pay expenses (in Ounces) | oz (10,545.6) (9,176.3)
Closing balance (in Ounces) | oz 7,435,283.1 5,962,503.8
Opening balance $ 491,706 $ 359,447
Creations 61,085 6,452
Redemptions (20,749) (19,439)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,351 954
Transfers of Bullion to pay expenses (773) (543)
Realized gain / (loss) on Bullion transferred to pay expenses 150 21
Change in unrealized gain / (loss) on investment in Bullion (8,769) 4,644
Closing balance $ 524,001 $ 351,536
Gold [Member]    
Bullion [Line Items]    
Opening balance (in Ounces) | oz 183,176.5 162,854.5
Creations (in Ounces) | oz 21,272.9 2,854.4
Redemptions (in Ounces) | oz (8,506.4) (8,559.3)
Transfers of Bullion to pay expenses (in Ounces) | oz (277.5) (241.5)
Closing balance (in Ounces) | oz 195,665.5 156,908.1
Opening balance $ 277,466 $ 208,722
Creations 34,157 3,714
Redemptions (12,944) (11,152)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,871 595
Transfers of Bullion to pay expenses (434) (313)
Realized gain / (loss) on Bullion transferred to pay expenses 78 15
Change in unrealized gain / (loss) on investment in Bullion 14,622 1,677
Closing balance $ 314,816 $ 203,258
Silver [Member]    
Bullion [Line Items]    
Opening balance (in Ounces) | oz 6,716,468.5 5,971,327.0
Creations (in Ounces) | oz 780,005.0 104,660.3
Redemptions (in Ounces) | oz (311,901.7) (313,839.5)
Transfers of Bullion to pay expenses (in Ounces) | oz (10,175.6) (8,854.3)
Closing balance (in Ounces) | oz 7,174,396.2 5,753,293.5
Opening balance $ 121,199 $ 92,347
Creations 13,848 1,638
Redemptions (4,157) (4,842)
Realized gain / (loss) on Bullion distributed for the redemption of Shares (1,212) (545)
Transfers of Bullion to pay expenses (172) (138)
Realized gain / (loss) on Bullion transferred to pay expenses (3) (14)
Change in unrealized gain / (loss) on investment in Bullion (29,564) (1,571)
Closing balance $ 99,939 $ 86,875
Platinum [Member]    
Bullion [Line Items]    
Opening balance (in Ounces) | oz 24,423.3 21,713.7
Creations (in Ounces) | oz 2,836.4 380.6
Redemptions (in Ounces) | oz (1,134.2) (1,141.2)
Transfers of Bullion to pay expenses (in Ounces) | oz (37.0) (32.2)
Closing balance (in Ounces) | oz 26,088.5 20,920.9
Opening balance $ 23,251 $ 17,241
Creations 2,637 309
Redemptions (786) (925)
Realized gain / (loss) on Bullion distributed for the redemption of Shares (366) (273)
Transfers of Bullion to pay expenses (32) (26)
Realized gain / (loss) on Bullion transferred to pay expenses (6) (8)
Change in unrealized gain / (loss) on investment in Bullion (5,732) 1,465
Closing balance $ 18,966 $ 17,783
Palladium [Member]    
Bullion [Line Items]    
Opening balance (in Ounces) | oz 36,635.0 32,570.6
Creations (in Ounces) | oz 4,254.6 570.9
Redemptions (in Ounces) | oz (1,701.3) (1,711.9)
Transfers of Bullion to pay expenses (in Ounces) | oz (55.5) (48.3)
Closing balance (in Ounces) | oz 39,132.8 31,381.3
Opening balance $ 69,790 $ 41,137
Creations 10,443 791
Redemptions (2,862) (2,520)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,058 1,177
Transfers of Bullion to pay expenses (135) (66)
Realized gain / (loss) on Bullion transferred to pay expenses 81 28
Change in unrealized gain / (loss) on investment in Bullion 11,905 3,073
Closing balance $ 90,280 $ 43,620