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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
oz
Mar. 31, 2017
USD ($)
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 490,964.7   1,314,799.6
Redemptions (in Ounces) | oz (163,632.6)   (54,878.1)
Transfers of Bullion to pay expenses (in Ounces) | oz (9,208.3)   (33,133.6)
Closing balance (in Ounces) | oz 6,434,720.2   6,116,596.4
Opening balance $ 362,116 $ 258,735 $ 258,735
Creations 29,443   75,226
Redemptions (9,785)   (3,145)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 484 51 51
Transfers of Bullion to pay expenses (553)   (1,887)
Realized gain / (loss) on Bullion transferred to pay expenses 30 (10) 16
Change in unrealized gain / (loss) on investment in Bullion (2,495) $ 24,221 33,120
Closing balance $ 379,240   $ 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 12,920.1   34,600.0
Redemptions (in Ounces) | oz (4,306.1)   (1,444.2)
Transfers of Bullion to pay expenses (in Ounces) | oz (242.3)   (871.9)
Closing balance (in Ounces) | oz 169,334.9   160,963.2
Opening balance $ 208,689 $ 149,152 $ 149,152
Creations 17,145   43,165
Redemptions (5,754)   (1,786)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 462   32
Transfers of Bullion to pay expenses (321)   (1,087)
Realized gain / (loss) on Bullion transferred to pay expenses 24   27
Change in unrealized gain / (loss) on investment in Bullion 3,929   19,186
Closing balance $ 224,174   $ 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 473,737.9   1,268,666.3
Redemptions (in Ounces) | oz (157,891.2)   (52,952.5)
Transfers of Bullion to pay expenses (in Ounces) | oz (8,885.2)   (31,971.0)
Closing balance (in Ounces) | oz 6,208,940.8   5,901,979.3
Opening balance $ 99,537 $ 76,624 $ 76,624
Creations 7,943   21,854
Redemptions (2,618)   (938)
Realized gain / (loss) on Bullion distributed for the redemption of Shares (139)   10
Transfers of Bullion to pay expenses (150)   (541)
Realized gain / (loss) on Bullion transferred to pay expenses (6)   (20)
Change in unrealized gain / (loss) on investment in Bullion (3,485)   2,548
Closing balance $ 101,082   $ 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 1,722.7   4,613.3
Redemptions (in Ounces) | oz (574.1)   (192.6)
Transfers of Bullion to pay expenses (in Ounces) | oz (32.3)   (116.3)
Closing balance (in Ounces) | oz 22,577.8   21,461.5
Opening balance $ 19,895 $ 15,562 $ 15,562
Creations 1,682   4,396
Redemptions (558)   (196)
Realized gain / (loss) on Bullion distributed for the redemption of Shares (63)   (19)
Transfers of Bullion to pay expenses (31)   (110)
Realized gain / (loss) on Bullion transferred to pay expenses (4)   (19)
Change in unrealized gain / (loss) on investment in Bullion 212   281
Closing balance $ 21,133   $ 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 2,584.0   6,920.0
Redemptions (in Ounces) | oz (861.2)   (288.8)
Transfers of Bullion to pay expenses (in Ounces) | oz (48.5)   (174.4)
Closing balance (in Ounces) | oz 33,866.7   32,192.4
Opening balance $ 33,995 $ 17,397 $ 17,397
Creations 2,673   5,811
Redemptions (855)   (225)
Realized gain / (loss) on Bullion distributed for the redemption of Shares 224   28
Transfers of Bullion to pay expenses (51)   (149)
Realized gain / (loss) on Bullion transferred to pay expenses 16   28
Change in unrealized gain / (loss) on investment in Bullion (3,151)   11,105
Closing balance $ 32,851   $ 33,995