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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Significant Accounting Policies [Abstract]    
Opening balance (in Shares) 2,200,000 [1] 2,100,000
Creations (in Shares) 250,000 250,000
Redemptions (in Shares) 0 (150,000)
Closing balance (in Shares) 2,450,000 2,200,000 [1]
Opening balance $ 202,243 [1],[2] $ 182,586
Creations 23,125 24,100
Redemptions 0 (13,644)
Adjustment to redemption value (7,177) 9,201
Closing balance $ 218,191 [2] $ 202,243 [1],[2]
Redemption value per Share at period end (in Dollars per share) $ 89.06 $ 91.93
[1] Derived from audited Statement of Financial Condition as of December 31, 2012.
[2] Authorized share capital is unlimited with no par value per Share. Shares issued and outstanding at March 31, 2013 were 2,450,000 and at December 31, 2012 were 2,200,000.