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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Significant Accounting Policies [Abstract]    
Opening balance (in Shares) 5,950,000 [1] 11,250,000
Creations (in Shares) 2,850,000 2,100,000
Redemptions (in Shares) (750,000) (7,400,000)
Closing balance (in Shares) 8,050,000 5,950,000 [1]
Opening balance $ 373,935,765 [1],[2] $ 884,637,847
Creations 191,567,625 167,166,365
Redemptions (45,934,276) (520,261,660)
Adjustment to redemption value (11,178,924) (157,606,787)
Closing balance $ 508,390,190 [2] $ 373,935,765 [1],[2]
Redemption value per Share at period end (in Dollars per share) $ 63.15 $ 62.85
[1] Derived from audited Statement of Financial Condition as of December 31, 2011.
[2] Authorized share capital is unlimited with no par value per share. Shares issued and outstanding at September 30, 2012 were 8,050,000 and at December 31, 2011 were 5,950,000