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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) 18,600,000 19,100,000 16,700,000
Creations (in Shares) 900,000 1,700,000 8,900,000
Redemptions (in Shares) (1,500,000) (2,200,000) (6,500,000)
Closing balance (in Shares) 18,000,000 18,600,000 19,100,000
Opening balance $ 551,340 [1] $ 534,305 $ 509,311
Creations 24,087 54,303 342,215
Redemptions (32,844) (64,809) (238,993)
Adjustment to redemption value (196,235) 27,541 (78,228)
Closing balance $ 346,348 [1] $ 551,340 [1] $ 534,305
Redemption value per Share at period end (in Dollars per share) $ 19.24 $ 29.64 $ 27.97
[1] Authorized share capital is unlimited and no par value per Share. Shares issued and outstanding at December 31, 2013 were 18,000,000 and at December 31, 2012 were 18,600,000.