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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
oz
Dec. 31, 2017
USD ($)
oz
Dec. 31, 2016
USD ($)
oz
Bullion [Line Items]      
Opening balance (in Ounces) | oz 6,116,596.4 4,889,808.5  
Creations (in Ounces) | oz 1,197,674.9 1,314,799.6  
Redemptions (in Ounces) | oz (1,088,501.7) (54,878.1)  
Transfers of Bullion to pay expenses (in Ounces) | oz (37,303.8) (33,133.6)  
Closing balance (in Ounces) | oz 6,188,465.8 6,116,596.4 4,889,808.5
Opening balance $ 362,116 $ 258,735  
Creations 69,065 75,226  
Redemptions (62,058) (3,145)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 115 51 $ (2,722)
Transfers of Bullion to pay expenses (2,134) (1,888)  
Realized gain / (loss) on Bullion transferred to pay expenses 13 17 6
Change in unrealized gain / (loss) on investment in Bullion (7,670) 33,120 9,000
Closing balance $ 359,447 $ 362,116 $ 258,735
Gold [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 160,963.2 128,679.3  
Creations (in Ounces) | oz 31,517.8 34,600.0  
Redemptions (in Ounces) | oz (28,644.8) (1,444.2)  
Transfers of Bullion to pay expenses (in Ounces) | oz (981.7) (871.9)  
Closing balance (in Ounces) | oz 162,854.5 160,963.2 128,679.3
Opening balance $ 208,689 $ 149,152  
Creations 40,379 43,165  
Redemptions (36,380) (1,786)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,087 32  
Transfers of Bullion to pay expenses (1,250) (1,087)  
Realized gain / (loss) on Bullion transferred to pay expenses 41 27  
Change in unrealized gain / (loss) on investment in Bullion (3,844) 19,186  
Closing balance $ 208,722 $ 208,689 $ 149,152
Silver [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 5,901,979.3 4,718,236.5  
Creations (in Ounces) | oz 1,155,651.2 1,268,666.3  
Redemptions (in Ounces) | oz (1,050,308.6) (52,952.5)  
Transfers of Bullion to pay expenses (in Ounces) | oz (35,994.9) (31,971.0)  
Closing balance (in Ounces) | oz 5,971,327.0 5,901,979.3 4,718,236.5
Opening balance $ 99,537 $ 76,624  
Creations 18,251 21,854  
Redemptions (16,605) (938)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares (1,675) 10  
Transfers of Bullion to pay expenses (570) (541)  
Realized gain / (loss) on Bullion transferred to pay expenses (57) (20)  
Change in unrealized gain / (loss) on investment in Bullion (6,534) 2,548  
Closing balance $ 92,347 $ 99,537 $ 76,624
Platinum [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 21,461.5 17,157.1  
Creations (in Ounces) | oz 4,202.4 4,613.3  
Redemptions (in Ounces) | oz (3,819.3) (192.6)  
Transfers of Bullion to pay expenses (in Ounces) | oz (130.9) (116.3)  
Closing balance (in Ounces) | oz 21,713.7 21,461.5 17,157.1
Opening balance $ 19,895 $ 15,562  
Creations 3,784 4,396  
Redemptions (3,357) (196)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares (744) (19)  
Transfers of Bullion to pay expenses (116) (110)  
Realized gain / (loss) on Bullion transferred to pay expenses (24) (19)  
Change in unrealized gain / (loss) on investment in Bullion (2,197) 281  
Closing balance $ 17,241 $ 19,895 $ 15,562
Palladium [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 32,192.4 25,735.6  
Creations (in Ounces) | oz 6,303.5 6,920.0  
Redemptions (in Ounces) | oz (5,729.0) (288.8)  
Transfers of Bullion to pay expenses (in Ounces) | oz (196.3) (174.4)  
Closing balance (in Ounces) | oz 32,570.6 32,192.4 25,735.6
Opening balance $ 33,995 $ 17,397  
Creations 6,651 5,811  
Redemptions (5,716) (225)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,447 28  
Transfers of Bullion to pay expenses (198) (149)  
Realized gain / (loss) on Bullion transferred to pay expenses 53 28  
Change in unrealized gain / (loss) on investment in Bullion 4,905 11,105  
Closing balance $ 41,137 $ 33,995 $ 17,397