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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Significant Accounting Policies [Abstract] |  |  |  |  |  |
Opening balance (in Shares) |  | 3,850,000 |  | 3,950,000 |  | 2,200,000
Creations (in Shares) |  | 1,000,000 |  | 1,850,000 |  | 2,050,000
Redemptions (in Shares) |  | (1,750,000) |  | (1,950,000) |  | (300,000)
Closing balance (in Shares) |  | 3,100,000 |  | 3,850,000 |  | 3,950,000
Opening balance |  |  |  | $ 260,358 |  | $ 202,243
Creations |  | $ 55,156 | [1] | 114,973 | [1] | 149,235
Redemptions |  | $ (111,755) | [1] | $ (131,123) | [1] | (20,607)
Adjustment to redemption value | [1] |  |  |  |  | (70,513)
Closing balance |  |  |  |  |  | $ 260,358
Redemption value per Share at period end (in Dollars per share) |  |  |  |  |  | $ 65.91
[1] | Effective January 1, 2014, the Trust has adopted the provisions of Topic 946. Refer to Note 2.1 for additional information.

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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