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Significant Accounting Policies (Schedule Of Investment In Silver) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
oz
Dec. 31, 2012
oz
Dec. 31, 2011
oz
Significant Accounting Policies [Abstract]      
Opening balance (in Ounces) 18,413,374.2 19,263,211.3 16,432,768.8
Creations (in Ounces) 890,077.9 1,684,899.6 9,048,980.8
Redemptions (in Ounces) (1,482,521.1) (2,479,571.6) (6,164,137.0)
Transfers of silver (in Ounces) (54,982.2) (55,165.1) (54,401.3)
Closing balance (in Ounces) 17,765,948.8 18,413,374.2 19,263,211.3
Opening balance $ 509,601,000 [1] $ 524,563,000 $ 329,357,000
Creations 24,087,000 54,303,000 348,315,000
Redemptions (41,085,000) (67,753,000) (151,790,000)
Transfers of silver (1,523,000) (1,512,000) (1,319,000)
Realized loss on investment in silver 144,644,000 0 0
Closing balance 346,436,000 [1] 509,601,000 [1] 524,563,000
Silver payable ounces of silver     297,810.213
Silver payable at lower of cost or market value     8,109,767
Silver Payable At Market Value $ 0 $ 0 $ 8,392,292
[1] The investment in silver is valued at the lower of cost or market value. Refer to note 2.1 for a breakdown of cost and market value of the investment in silver.