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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, 2014
Dec. 31, 2013
Significant Accounting Policies [Abstract]    
Opening balance (in Shares) 7,350,000 [1] 7,250,000
Creations (in Shares) 150,000 [2] 2,000,000
Redemptions (in Shares) (900,000) [2] (1,900,000)
Closing balance (in Shares) 6,600,000 [2] 7,350,000 [1]
Opening balance $ 510,214 [1],[3] $ 497,765
Creations 11,436 [2] 140,584
Redemptions (64,684) [2] (133,958)
Adjustment to redemption value   (5,823)
Closing balance $ 500,581 [2],[3] $ 510,214 [1],[3]
Redemption value per Share at period end (in Dollars per share)   $ 69.42
[1] Derived from audited Statement of Financial Condition as of December 31, 2013. The amounts are those previously reported under non investment company accounting. Refer to Note 2.1 for additional information.
[2] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946, Investment Companies, and follows specialized accounting. Refer to Note 2.1 for additional information.
[3] Authorized share capital is unlimited with no par value per Share. Shares issued and outstanding at March 31, 2014 were 6,600,000 and at December 31, 2013 were 7,350,000. Net asset value per Share at March 31, 2014 and December 31, 2013 was $75.85 and $69.42, respectively.