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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
oz
Dec. 31, 2016
USD ($)
oz
Dec. 31, 2015
USD ($)
oz
Significant Accounting Policies [Abstract]      
Opening balance (in Ounces) | oz 263,819.3 337,804.6  
Creations (in Ounces) | oz 43,021.8 38,467.6  
Redemptions (in Ounces) | oz (76,489.4) (110,603.9)  
Transfers of palladium to pay expenses (in Ounces) | oz (1,488.6) (1,849.0)  
Closing balance (in Ounces) | oz 228,863.1 263,819.3 337,804.6
Investment in palladium, fair value, Opening balance $ 178,342 $ 184,779  
Creations 37,402 22,809  
Redemptions (64,629) (69,265)  
Realized gain / (loss) on palladium distributed for the redemption of Shares 14,337 (1,837) $ 5,055
Transfers of palladiuim to pay expenses (1,244) (1,107)  
Realized gain / (loss) on palladium transferred to pay expenses 266 (82) 183
Change in unrealized gain / (loss) on investment in palladium 77,205 43,045 (109,035)
Investment in palladium, fair value, closing balance $ 241,679 $ 178,342 $ 184,779