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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
oz
Mar. 31, 2016
USD ($)
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     38,467.6
Redemptions (in Ounces) | oz (9,587.2)   (110,603.9)
Transfers of palladium to pay expenses (in Ounces) | oz (381.6)   (1,849.0)
Closing balance (in Ounces) | oz 253,850.5   263,819.3
Investment in palladium, fair value, Opening balance $ 178,342 $ 184,779 $ 184,779
Creations     22,809
Redemptions (7,286)   (69,265)
Realized gain / (loss) on palladium distributed for the redemption of Shares 1,138 (3,768) (1,837)
Transfers of palladiuim to pay expenses (278)   (1,107)
Realized gain / (loss) on palladium transferred to pay expenses 34 (63) (82)
Change in unrealized gain on investment in palladium 30,623 $ 10,255 43,045
Investment in palladium, fair value, closing balance $ 202,573   $ 178,342