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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
oz
Dec. 31, 2016
USD ($)
oz
Dec. 31, 2015
USD ($)
oz
Bullion [Line Items]      
Opening balance (in Ounces) | oz 4,889,808.5 3,426,930.6  
Creations (in Ounces) | oz 1,314,799.6 1,981,707.3  
Redemptions (in Ounces) | oz (54,878.1) (496,777.6)  
Transfers of Bullion to pay expenses (in Ounces) | oz (33,133.6) (22,051.8)  
Closing balance (in Ounces) | oz 6,116,596.4 4,889,808.5 3,426,930.6
Opening balance $ 258,735 $ 161,846  
Creations 75,226 116,457  
Redemptions (3,145) (24,619)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 51 (2,722) $ 391
Transfers of Bullion to pay expenses (1,888) (1,233)  
Realized gain / (loss) on Bullion transferred to pay expenses 17 6 (55)
Change in unrealized gain on investment in Bullion 33,120 9,000 (18,186)
Closing balance $ 362,116 $ 258,735 $ 161,846
Gold [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 128,679.3 90,182.5  
Creations (in Ounces) | oz 34,600.0 52,150.2  
Redemptions (in Ounces) | oz (1,444.2) (13,073.1)  
Transfers of Bullion to pay expenses (in Ounces) | oz (871.9) (580.3)  
Closing balance (in Ounces) | oz 160,963.2 128,679.3 90,182.5
Opening balance $ 149,152 $ 95,796  
Creations 43,165 67,230  
Redemptions (1,786) (14,773)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 32 (544)  
Transfers of Bullion to pay expenses (1,087) (722)  
Realized gain / (loss) on Bullion transferred to pay expenses 27 31  
Change in unrealized gain on investment in Bullion 19,186 2,134  
Closing balance $ 208,689 $ 149,152 $ 95,796
Silver [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 4,718,236.5 3,306,687.6  
Creations (in Ounces) | oz 1,268,666.3 1,912,173.7  
Redemptions (in Ounces) | oz (52,952.5) (479,346.8)  
Transfers of Bullion to pay expenses (in Ounces) | oz (31,971.0) (21,278.0)  
Closing balance (in Ounces) | oz 5,901,979.3 4,718,236.5 3,306,687.6
Opening balance $ 76,624 $ 45,699  
Creations 21,854 35,223  
Redemptions (938) (6,974)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 10 (1,195)  
Transfers of Bullion to pay expenses (541) (364)  
Realized gain / (loss) on Bullion transferred to pay expenses (20) (4)  
Change in unrealized gain on investment in Bullion 2,548 4,239  
Closing balance $ 99,537 $ 76,624 $ 45,699
Platinum [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 17,157.1 12,024.2  
Creations (in Ounces) | oz 4,613.3 6,953.4  
Redemptions (in Ounces) | oz (192.6) (1,743.1)  
Transfers of Bullion to pay expenses (in Ounces) | oz (116.3) (77.4)  
Closing balance (in Ounces) | oz 21,461.5 17,157.1 12,024.2
Opening balance $ 15,562 $ 10,485  
Creations 4,396 7,221  
Redemptions (196) (1,522)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares (19) (522)  
Transfers of Bullion to pay expenses (110) (76)  
Realized gain / (loss) on Bullion transferred to pay expenses (19) (13)  
Change in unrealized gain on investment in Bullion 281 (11)  
Closing balance $ 19,895 $ 15,562 $ 10,485
Palladium [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 25,735.6 18,036.3  
Creations (in Ounces) | oz 6,920.0 10,430.0  
Redemptions (in Ounces) | oz (288.8) (2,614.6)  
Transfers of Bullion to pay expenses (in Ounces) | oz (174.4) (116.1)  
Closing balance (in Ounces) | oz 32,192.4 25,735.6 18,036.3
Opening balance $ 17,397 $ 9,866  
Creations 5,811 6,783  
Redemptions (225) (1,350)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 28 (461)  
Transfers of Bullion to pay expenses (149) (71)  
Realized gain / (loss) on Bullion transferred to pay expenses 28 (8)  
Change in unrealized gain on investment in Bullion 11,105 2,638  
Closing balance $ 33,995 $ 17,397 $ 9,866