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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
oz
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
oz
Jun. 30, 2015
USD ($)
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     (52,990.5)   (188,665.9)
Transfers of palladium to pay expenses (in Ounces) | oz     (968.9)   (2,624.4)
Closing balance (in Ounces) | oz 307,917.6   307,917.6   337,804.6
Investment in palladium, fair value, Opening balance     $ 184,779 $ 410,663 $ 410,663
Creations     13,524   7,799
Redemptions     (29,105)   (127,993)
Realized (loss) / gain on palladium distributed for the redemption of Shares $ (1,297) $ 1,099 (5,066) 8,554 5,055
Transfers of palladiuim to pay expenses     (530)   (1,893)
Realized (loss) / gain on palladium transferred to pay expenses (33) 89 (96) 191 183
Change in unrealized gain / (loss) on investment in palladium 7,602 $ (24,328) 17,857 $ (64,003) (109,035)
Investment in palladium, fair value, closing balance $ 181,363   $ 181,363   $ 184,779