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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) 2,200,000 2,100,000 1,900,000
Creations (in Shares) 2,050,000 250,000 1,450,000
Redemptions (in Shares) (300,000) (150,000) (1,250,000)
Closing balance (in Shares) 3,950,000 2,200,000 2,100,000
Opening balance $ 202,243 [1] $ 182,586 $ 166,379
Creations 149,235 24,100 143,112
Redemptions (20,607) (13,644) (120,762)
Adjustment to redemption value (70,513) 9,201 (6,143)
Closing balance $ 260,358 [1] $ 202,243 [1] $ 182,586
Redemption value per Share at period end (in Dollars per share) $ 65.91 $ 91.93 $ 86.95
[1] Authorized share capital is unlimited and no par value per Share. Shares issued and outstanding at December 31, 2013 were 3,950,000 and at December 31, 2012 were 2,200,000.