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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) 5,150,000 7,350,000 7,250,000
Creations (in Shares) 150,000 250,000 2,000,000
Redemptions (in Shares) (1,850,000) (2,450,000) (1,900,000)
Closing balance (in Shares) 3,450,000 5,150,000 7,350,000
Opening balance   $ 510,214 $ 497,765
Creations $ 7,799 [1] 19,757 [1] 140,584
Redemptions $ (118,825) [1] $ (186,274) [1] (133,958)
Adjustment of redeembable Shares to redemption value [1]     5,823
Closing balance     $ 510,214
Redemption value per Share at period end (in Dollars per share)     $ 69.42
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946. Refer to Note 2.1 for additional information.