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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
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.