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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, 2017
USD ($)
oz
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
oz
Jun. 30, 2016
USD ($)
oz
Dec. 31, 2016
USD ($)
oz
Significant Accounting Policies [Abstract]          
Opening balance (in Ounces) | oz     263,819.3 337,804.6 337,804.6
Creations (in Ounces) | oz     28,701.7   38,467.6
Redemptions (in Ounces) | oz     (47,854.5)   (110,603.9)
Transfers of palladium to pay expenses (in Ounces) | oz     (765.3)   (1,849.0)
Closing balance (in Ounces) | oz 243,901.2   243,901.2   263,819.3
Investment in palladium, fair value, Opening balance     $ 178,342 $ 184,779 $ 184,779
Creations     23,669   22,809
Redemptions     (37,508)   (69,265)
Realized gain / (loss) on palladium distributed for the redemption of Shares $ 5,315 $ (1,297) 6,453 (5,066) (1,837)
Transfers of palladiuim to pay expenses     (581)   (1,107)
Realized gain / (loss) on palladium transferred to pay expenses 54 (33) 88 (96) (82)
Change in unrealized gain on investment in palladium 4,035 $ 7,602 34,658 $ 17,857 43,045
Investment in palladium, fair value, closing balance $ 205,121   $ 205,121   $ 178,342