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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) 3,950,000 [1] 2,200,000
Creations (in Shares) 250,000 [2] 2,050,000
Redemptions (in Shares) (1,500,000) [2] (300,000)
Closing balance (in Shares) 2,700,000 [2] 3,950,000 [1]
Opening balance $ 260,358 [1],[3] $ 202,243
Creations 17,776 [2] 149,235
Redemptions (102,078) [2] (20,607)
Adjustment to redemption value   (70,513)
Closing balance $ 187,928 [2],[3] $ 260,358 [1],[3]
Redemption value per Share at period end (in Dollars per share)   $ 65.91
[1] Derived from audited Statement of Financial Condition as of December 31, 2013.
[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 2,700,000 and at December 31, 2013 were 3,950,000.