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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, 2018
USD ($)
oz
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
oz
Jun. 30, 2017
USD ($)
oz
Dec. 31, 2017
USD ($)
oz
Bullion [Line Items]          
Opening balance (in Ounces) | oz     6,116,596.4 4,889,808.5 4,889,808.5
Creations (in Ounces) | oz     708,839.0   1,314,799.6
Redemptions (in Ounces) | oz     (708,104.8)   (54,878.1)
Transfers of Bullion to pay expenses (in Ounces) | oz     (12,484.6)   (33,133.6)
Closing balance (in Ounces) | oz 6,104,846.0   6,104,846.0   6,116,596.4
Opening balance     $ 362,116 $ 258,735 $ 258,735
Creations     42,211   75,226
Redemptions     (41,576)   (3,145)
Realized gain / (loss) on Bullion distributed for the redemption of Shares $ 789 $ 0 1,273 51 51
Transfers of Bullion to pay expenses     (764)   (1,887)
Realized gain / (loss) on Bullion transferred to pay expenses 21 5 51 (5) 16
Change in unrealized gain / (loss) on investment in Bullion (16,650) $ (8,153) (19,145) $ 16,068 33,120
Closing balance $ 344,166   $ 344,166   $ 362,116
Gold [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     160,963.2 128,679.3 128,679.3
Creations (in Ounces) | oz     18,653.7   34,600.0
Redemptions (in Ounces) | oz     (18,634.3)   (1,444.2)
Transfers of Bullion to pay expenses (in Ounces) | oz     (328.5)   (871.9)
Closing balance (in Ounces) | oz 160,654.1   160,654.1   160,963.2
Opening balance     $ 208,689 $ 149,152 $ 149,152
Creations     24,646   43,165
Redemptions     (24,332)   (1,786)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     1,379   32
Transfers of Bullion to pay expenses     (448)   (1,087)
Realized gain / (loss) on Bullion transferred to pay expenses     46   27
Change in unrealized gain / (loss) on investment in Bullion     (9,091)   19,186
Closing balance $ 200,889   $ 200,889   $ 208,689
Silver [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     5,901,979.3 4,718,236.5 4,718,236.5
Creations (in Ounces) | oz     683,967.4   1,268,666.3
Redemptions (in Ounces) | oz     (683,259.0)   (52,952.5)
Transfers of Bullion to pay expenses (in Ounces) | oz     (12,046.6)   (31,971.0)
Closing balance (in Ounces) | oz 5,890,641.1   5,890,641.1   5,901,979.3
Opening balance     $ 99,537 $ 76,624 $ 76,624
Creations     11,402   21,854
Redemptions     (11,249)   (938)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     (664)   10
Transfers of Bullion to pay expenses     (205)   (541)
Realized gain / (loss) on Bullion transferred to pay expenses     (14)   (20)
Change in unrealized gain / (loss) on investment in Bullion     (4,380)   2,548
Closing balance $ 94,427   $ 94,427   $ 99,537
Platinum [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     21,461.5 17,157.1 17,157.1
Creations (in Ounces) | oz     2,487.2   4,613.3
Redemptions (in Ounces) | oz     (2,484.6)   (192.6)
Transfers of Bullion to pay expenses (in Ounces) | oz     (43.8)   (116.3)
Closing balance (in Ounces) | oz 21,420.3   21,420.3   21,461.5
Opening balance     $ 19,895 $ 15,562 $ 15,562
Creations     2,375   4,396
Redemptions     (2,286)   (196)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     (390)   (19)
Transfers of Bullion to pay expenses     (43)   (110)
Realized gain / (loss) on Bullion transferred to pay expenses     (9)   (19)
Change in unrealized gain / (loss) on investment in Bullion     (1,313)   281
Closing balance $ 18,229   $ 18,229   $ 19,895
Palladium [Member]          
Bullion [Line Items]          
Opening balance (in Ounces) | oz     32,192.4 25,735.6 25,735.6
Creations (in Ounces) | oz     3,730.7   6,920.0
Redemptions (in Ounces) | oz     (3,726.9)   (288.8)
Transfers of Bullion to pay expenses (in Ounces) | oz     (65.7)   (174.4)
Closing balance (in Ounces) | oz 32,130.5   32,130.5   32,192.4
Opening balance     $ 33,995 $ 17,397 $ 17,397
Creations     3,788   5,811
Redemptions     (3,709)   (225)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     948   28
Transfers of Bullion to pay expenses     (68)   (149)
Realized gain / (loss) on Bullion transferred to pay expenses     28   28
Change in unrealized gain / (loss) on investment in Bullion     (4,361)   11,105
Closing balance $ 30,621   $ 30,621   $ 33,995