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Significant Accounting Policies (Schedule Of Investment In Bullion) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
oz
Dec. 31, 2018
USD ($)
oz
Dec. 31, 2017
USD ($)
oz
Bullion [Line Items]      
Opening balance (in Ounces) | oz 6,188,465.8 6,116,596.4  
Creations (in Ounces) | oz 1,297,191.6 1,197,674.9  
Redemptions (in Ounces) | oz (487,505.4) (1,088,501.7)  
Transfers of Bullion to pay expenses (in Ounces) | oz (37,448.7) (37,303.8)  
Closing balance (in Ounces) | oz 6,960,703.3 6,188,465.8 6,116,596.4
Opening balance $ 359,447 $ 362,116  
Creations 85,569 69,065  
Redemptions (29,569) (62,058)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,807 115 $ 51
Transfers of Bullion to pay expenses (2,339) (2,134)  
Realized gain / (loss) on Bullion transferred to pay expenses 196 13 17
Change in unrealized gain / (loss) on investment in Bullion 76,595 (7,670) 33,120
Closing balance $ 491,706 $ 359,447 $ 362,116
Gold [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 162,854.5 160,963.2  
Creations (in Ounces) | oz 34,136.6 31,517.8  
Redemptions (in Ounces) | oz (12,829.1) (28,644.8)  
Transfers of Bullion to pay expenses (in Ounces) | oz (985.5) (981.7)  
Closing balance (in Ounces) | oz 183,176.5 162,854.5 160,963.2
Opening balance $ 208,722 $ 208,689  
Creations 49,398 40,379  
Redemptions (17,079) (36,380)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,217 1,087  
Transfers of Bullion to pay expenses (1,354) (1,250)  
Realized gain / (loss) on Bullion transferred to pay expenses 130 41  
Change in unrealized gain / (loss) on investment in Bullion 36,432 (3,844)  
Closing balance $ 277,466 $ 208,722 $ 208,689
Silver [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 5,971,327.0 5,901,979.3  
Creations (in Ounces) | oz 1,251,676.2 1,155,651.2  
Redemptions (in Ounces) | oz (470,400.0) (1,050,308.6)  
Transfers of Bullion to pay expenses (in Ounces) | oz (36,134.7) (35,994.9)  
Closing balance (in Ounces) | oz 6,716,468.5 5,971,327.0 5,901,979.3
Opening balance $ 92,347 $ 99,537  
Creations 21,274 18,251  
Redemptions (7,313) (16,605)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares (754) (1,675)  
Transfers of Bullion to pay expenses (578) (570)  
Realized gain / (loss) on Bullion transferred to pay expenses (41) (57)  
Change in unrealized gain / (loss) on investment in Bullion 16,264 (6,534)  
Closing balance $ 121,199 $ 92,347 $ 99,537
Platinum [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 21,713.7 21,461.5  
Creations (in Ounces) | oz 4,551.5 4,202.4  
Redemptions (in Ounces) | oz (1,710.5) (3,819.3)  
Transfers of Bullion to pay expenses (in Ounces) | oz (131.4) (130.9)  
Closing balance (in Ounces) | oz 24,423.3 21,713.7 21,461.5
Opening balance $ 17,241 $ 19,895  
Creations 4,062 3,784  
Redemptions (1,412) (3,357)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares (379) (744)  
Transfers of Bullion to pay expenses (112) (116)  
Realized gain / (loss) on Bullion transferred to pay expenses (25) (24)  
Change in unrealized gain / (loss) on investment in Bullion 3,876 (2,197)  
Closing balance $ 23,251 $ 17,241 $ 19,895
Palladium [Member]      
Bullion [Line Items]      
Opening balance (in Ounces) | oz 32,570.6 32,192.4  
Creations (in Ounces) | oz 6,827.3 6,303.5  
Redemptions (in Ounces) | oz (2,565.8) (5,729.0)  
Transfers of Bullion to pay expenses (in Ounces) | oz (197.1) (196.3)  
Closing balance (in Ounces) | oz 36,635.0 32,570.6 32,192.4
Opening balance $ 41,137 $ 33,995  
Creations 10,835 6,651  
Redemptions (3,765) (5,716)  
Realized gain / (loss) on Bullion distributed for the redemption of Shares 1,723 1,447  
Transfers of Bullion to pay expenses (295) (198)  
Realized gain / (loss) on Bullion transferred to pay expenses 132 53  
Change in unrealized gain / (loss) on investment in Bullion 20,023 4,905  
Closing balance $ 69,790 $ 41,137 $ 33,995