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Significant Accounting Policies (Schedule Of Investment In Silver) (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     19,171,529.7 17,953,851.0 17,953,851.0
Creations (in Ounces) | oz     1,808,090.6   1,958,468.7
Redemptions (in Ounces) | oz     (586,404.1)   (685,202.5)
Transfers of silver to pay expenses (in Ounces) | oz     (29,494.4)   (55,587.5)
Closing balance (in Ounces) | oz 20,363,721.8   20,363,721.8   19,171,529.7
Opening balance     $ 311,346 $ 248,122 $ 248,122
Creations     30,469   35,054
Redemptions     (10,251)   (11,200)
Realized loss on silver distributed for the redemption of Shares $ (344) $ 0 (914) (779) (1,974)
Transfers of silver to pay expenses     (507)   (941)
Realized loss on silver transferred to pay expenses (24) (41) (55) (108) (127)
Change in unrealized (loss) / gain on investment in silver (31,284) $ 54,399 5,302 $ 83,259 42,412
Closing balance $ 335,390   $ 335,390   $ 311,346