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Significant Accounting Policies (Schedule Of Investment In Platinum) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
oz
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
oz
Sep. 30, 2016
USD ($)
oz
Dec. 31, 2016
USD ($)
oz
Significant Accounting Policies [Abstract]          
Opening balance (in Ounces) | oz     522,844.9 463,267.0 463,267.0
Creations (in Ounces) | oz     90,932.5   144,283.4
Redemptions (in Ounces) | oz     (62,176.4)   (81,759.3)
Transfers of platinum to pay expenses (in Ounces) | oz     (2,459.4)   (2,946.2)
Closing balance (in Ounces) | oz 549,141.6   549,141.6   522,844.9
Opening balance     $ 474,220 $ 403,969 $ 403,969
Creations     87,054   143,689
Redemptions     (59,178)   (81,161)
Realized loss on platinum distributed for the redemption of Shares $ (4,463) $ (6,640) (16,357) (20,604) (23,578)
Transfers of platinum to pay expenses     (2,338)   (2,907)
Realized loss on platinum transferred to pay expenses (220) (154) (660) (669) (869)
Change in unrealized gain on investment in platinum 4,451 $ 23,773 22,469 $ 96,716 35,077
Closing balance $ 505,210   $ 505,210   $ 474,220