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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) 11,750,000 [1] 10,750,000
Creations (in Shares) 150,000 1,600,000
Redemptions (in Shares) (2,250,000) (600,000)
Closing balance (in Shares) 9,650,000 11,750,000 [1]
Opening balance $ 1,930,056 [1],[2] $ 1,677,363
Creations 22,225 268,941
Redemptions (307,394) (98,455)
Adjustment to redemption value (384,964) 82,207
Closing balance $ 1,259,923 [2] $ 1,930,056 [1],[2]
Redemption value per Share at period end (in Dollars per Share) $ 130.56 $ 164.26
[1] Derived from audited Statement of Financial Condition as of December 31, 2012.
[2] Authorized share capital is unlimited with no par value per Share. Shares issued and outstanding at September 30, 2013 were 9,650,000 and at December 31, 2012 were 11,750,000.