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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) 8,750,000 [1] 11,750,000
Creations (in Shares) 0 150,000
Redemptions (in Shares) (50,000) (3,150,000)
Closing balance (in Shares) 8,700,000 8,750,000 [1]
Opening balance $ 1,033,745 $ 1,930,056
Creations 0 [2] 22,226
Redemptions (6,152) [2] (418,671)
Adjustment to redemption value   (499,866)
Closing balance   $ 1,033,745
Redemption value per Share at period end (in Dollars per share)   $ 118.14
[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.