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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
oz
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
oz
Sep. 30, 2016
USD ($)
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     1,041,627.6   1,981,707.3
Redemptions (in Ounces) | oz     (54,878.1)   (496,777.6)
Transfers of Bullion to pay expenses (in Ounces) | oz     (24,244.1)   (22,051.8)
Closing balance (in Ounces) | oz 5,852,313.9   5,852,313.9   4,889,808.5
Opening balance     $ 258,735 $ 161,846 $ 161,846
Creations     59,288   116,457
Redemptions     (3,144)   (24,619)
Realized gain / (loss) on Bullion distributed for the redemption of Shares $ 0 $ 0 51 (2,721) (2,722)
Transfers of Bullion to pay expenses     (1,369)   (1,233)
Realized (loss) / gain on Bullion transferred to pay expenses 6 25 1 (3) 6
Change in unrealized gain on investment in Bullion 10,878 $ 5,190 26,946 $ 45,634 9,000
Closing balance $ 340,508   $ 340,508   $ 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     27,411.3   52,150.2
Redemptions (in Ounces) | oz     (1,444.2)   (13,073.1)
Transfers of Bullion to pay expenses (in Ounces) | oz     (638.0)   (580.3)
Closing balance (in Ounces) | oz 154,008.4   154,008.4   128,679.3
Opening balance     $ 149,152 $ 95,796 $ 95,796
Creations     33,970   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     (788)   (722)
Realized (loss) / gain on Bullion transferred to pay expenses     12   31
Change in unrealized gain on investment in Bullion     17,015   2,134
Closing balance $ 197,608   $ 197,608   $ 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     1,005,079.2   1,912,173.7
Redemptions (in Ounces) | oz     (52,952.5)   (479,346.8)
Transfers of Bullion to pay expenses (in Ounces) | oz     (23,393.4)   (21,278.0)
Closing balance (in Ounces) | oz 5,646,969.8   5,646,969.8   4,718,236.5
Opening balance     $ 76,624 $ 45,699 $ 45,699
Creations     17,413   35,223
Redemptions     (938)   (6,974)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     9   (1,195)
Transfers of Bullion to pay expenses     (396)   (364)
Realized (loss) / gain on Bullion transferred to pay expenses     (14)   (4)
Change in unrealized gain on investment in Bullion     2,510   4,239
Closing balance $ 95,208   $ 95,208   $ 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     3,654.8   6,953.4
Redemptions (in Ounces) | oz     (192.6)   (1,743.1)
Transfers of Bullion to pay expenses (in Ounces) | oz     (85.1)   (77.4)
Closing balance (in Ounces) | oz 20,534.2   20,534.2   17,157.1
Opening balance     $ 15,562 $ 10,485 $ 10,485
Creations     3,511   7,221
Redemptions     (196)   (1,522)
Realized gain / (loss) on Bullion distributed for the redemption of Shares     (19)   (522)
Transfers of Bullion to pay expenses     (81)   (76)
Realized (loss) / gain on Bullion transferred to pay expenses     (13)   (13)
Change in unrealized gain on investment in Bullion     128   (11)
Closing balance $ 18,892   $ 18,892   $ 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     5,482.3   10,430.0
Redemptions (in Ounces) | oz     (288.8)   (2,614.6)
Transfers of Bullion to pay expenses (in Ounces) | oz     (127.6)   (116.1)
Closing balance (in Ounces) | oz 30,801.5   30,801.5   25,735.6
Opening balance     $ 17,397 $ 9,866 $ 9,866
Creations     4,394   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     (104)   (71)
Realized (loss) / gain on Bullion transferred to pay expenses     16   (8)
Change in unrealized gain on investment in Bullion     7,293   2,638
Closing balance $ 28,800   $ 28,800   $ 17,397