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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Significant Accounting Policies [Abstract]    
Opening balance (in Shares) 2,200,000 [1] 2,100,000
Creations (in Shares) 550,000 250,000
Redemptions (in Shares) (50,000) (150,000)
Closing balance (in Shares) 2,700,000 2,200,000 [1]
Opening balance $ 202,243 [1] $ 182,586
Creations 46,180 24,100
Redemptions (3,766) (13,644)
Adjustment to redemption value (49,311) 9,201
Closing balance $ 195,346 $ 202,243 [1]
Redemption value per Share at period end (in Dollars per share) $ 72.35 $ 91.93
[1] Derived from audited Statement of Financial Condition as of December 31, 2012.