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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) 7,250,000 [1] 5,950,000
Creations (in Shares) 1,750,000 2,900,000
Redemptions (in Shares) (1,200,000) (1,600,000)
Closing balance (in Shares) 7,800,000 7,250,000 [1]
Opening balance $ 497,765 [1],[2] $ 373,935
Creations 122,635 194,997
Redemptions (84,938) (98,852)
Adjustment to redemption value 18,252 27,685
Closing balance $ 553,714 [2] $ 497,765 [1],[2]
Redemption value per Share at period end (in Dollars per share) $ 70.99 $ 68.66
[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 7,800,000 and at December 31, 2012 were