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Significant Accounting Policies (Schedule Of Investment In Silver) (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 19,171,529.7 17,953,851.0  
Creations (in Ounces) | oz 3,027,876.1 1,958,468.7  
Redemptions (in Ounces) | oz (1,318,192.7) (685,202.5)  
Transfers of silver to pay expenses (in Ounces) | oz (60,558.7) (55,587.5)  
Closing balance (in Ounces) | oz 20,820,654.4 19,171,529.7 17,953,851.0
Opening balance $ 311,346 $ 248,122  
Creations 50,050 35,054  
Redemptions (22,486) (11,200)  
Realized loss on silver distributed for the redemption of Shares (2,476) (1,974) $ (3,789)
Transfers of silver to pay expenses (1,030) (941)  
Realized loss on silver transferred to pay expenses (120) (127) (193)
Change in unrealized gain / (loss) on investment in silver 15,856 42,412 (33,466)
Closing balance $ 351,140 $ 311,346 $ 248,122