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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
oz
Mar. 31, 2015
USD ($)
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 9,636.3   14,479.4
Redemptions (in Ounces) | oz (33,741.7)   (188,665.9)
Transfers of palladium to pay expenses (in Ounces) | oz (495.2)   (2,624.4)
Closing balance (in Ounces) | oz 313,204.0   337,804.6
Investment in palladium, fair value, Opening balance $ 184,779 $ 410,663 $ 410,663
Creations 5,301   7,799
Redemptions (18,032)   (127,993)
Realized (loss) / gain on palladium distributed for the redemption of Shares (3,768) 7,455 5,055
Transfers of palladiuim to pay expenses (259)   (1,893)
Realized (loss) / gain on palladium transferred to pay expenses (63) 102 183
Change in unrealized gain / (loss) on investment in palladium 10,255 $ (39,675) (109,035)
Investment in palladium, fair value, closing balance $ 178,213   $ 184,779