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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) 10,750,000 8,250,000 3,050,000
Creations (in Shares) 1,600,000 2,950,000 5,250,000
Redemptions (in Shares) (600,000) (450,000) (50,000)
Closing balance (in Shares) 11,750,000 10,750,000 8,250,000
Opening balance $ 1,677,363 [1] $ 1,157,505 $ 336,294
Creations 268,941 466,053 650,948
Redemptions (98,455) (71,329) (6,114)
Adjustment to redemption value 82,207 125,134 176,377
Closing balance $ 1,930,056 [1] $ 1,677,363 [1] $ 1,157,505
Redemption value per Share at period end (in Dollars per Share) $ 164.26 $ 156.03 $ 140.30
[1] Authorized share capital is unlimited and no par value per Share. Shares issued and outstanding at December 31, 2012 were 11,750,000 and at December 31, 2011 were 10,750,000.