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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
oz
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
oz
Sep. 30, 2015
USD ($)
oz
Dec. 31, 2015
USD ($)
oz
Significant Accounting Policies [Abstract]          
Opening balance (in Ounces) | oz     337,804.6 514,615.5 514,615.5
Creations (in Ounces) | oz     24,072.4   14,479.4
Redemptions (in Ounces) | oz     (77,022.0)   (188,665.9)
Transfers of palladium to pay expenses (in Ounces) | oz     (1,423.6)   (2,624.4)
Closing balance (in Ounces) | oz 283,431.4   283,431.4   337,804.6
Investment in palladium, fair value, Opening balance     $ 184,779 $ 410,663 $ 410,663
Creations     13,524   7,799
Redemptions     (45,148)   (127,993)
Realized gain / (loss) on palladium distributed for the redemption of Shares $ 638 $ (2,327) (4,428) 6,226 5,055
Transfers of palladiuim to pay expenses     (817)   (1,893)
Realized (loss) / gain on palladium transferred to pay expenses (4) 3 (100) 195 183
Change in unrealized gain / (loss) on investment in palladium 38,972 $ (8,047) 56,828 $ (72,050) (109,035)
Investment in palladium, fair value, closing balance $ 204,638   $ 204,638   $ 184,779