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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Significant Accounting Policies [Abstract]    
Opening balance (in Shares) 7,250,000 [1] 5,950,000
Creations (in Shares) 1,700,000 2,900,000
Redemptions (in Shares) (800,000) (1,600,000)
Closing balance (in Shares) 8,150,000 7,250,000 [1]
Opening balance $ 497,765 [1],[2] $ 373,935
Creations 119,091 194,997
Redemptions (56,181) (98,852)
Adjustment to redemption value (47,481) 27,685
Closing balance $ 513,194 [2] $ 497,765 [1],[2]
Redemption value per Share at period end (in Dollars per share) $ 62.97 $ 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 June 30, 2013 were 8,150,000 and at December 31, 2012 were