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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Significant Accounting Policies [Abstract]      
Opening balance (in Shares) 11,750,000 10,750,000 8,250,000
Creations (in Shares) 150,000 1,600,000 2,950,000
Redemptions (in Shares) (3,150,000) (600,000) (450,000)
Closing balance (in Shares) 8,750,000 11,750,000 10,750,000
Opening balance $ 1,930,056 [1] $ 1,677,363 $ 1,157,505
Creations 22,226 268,941 466,053
Redemptions (418,671) (98,455) (71,329)
Adjustment to redemption value (499,866) 82,207 125,134
Closing balance $ 1,033,745 [1] $ 1,930,056 [1] $ 1,677,363
Redemption value per Share at period end (in Dollars per Share) $ 118.14 $ 164.26 $ 156.03
[1] Authorized share capital is unlimited and no par value per Share. Shares issued and outstanding at December 31, 2013 were 8,750,000 and at December 31, 2012 were 11,750,000.