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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Abstract]      
Opening balance (in Shares) 5,950,000 11,250,000 [1] 0 [1]
Creations (in Shares) 2,900,000 2,100,000 13,050,000 [1]
Redemptions (in Shares) (1,600,000) (7,400,000) (1,800,000) [1]
Closing balance (in Shares) 7,250,000 5,950,000 11,250,000 [1]
Opening balance $ 373,935 [2] $ 884,638 [1] $ 0 [1]
Creations 194,997 167,166 709,716 [1]
Redemptions (98,852) (520,262) (102,027) [1]
Adjustment to redemption value 27,685 (157,607) 276,949 [1]
Closing balance $ 497,765 [2] $ 373,935 [2] $ 884,638 [1]
Redemption value per Share at period end (in Dollars per share) $ 68.66 $ 62.85 $ 78.63 [1]
[1] Date of Inception
[2] Authorized Share capital is unlimited and no par value per Share. Shares issued and outstanding at December 31, 2012 were 7,250,000 and at December 31, 2011 were 5,950,000.