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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) 5,200,000 5,400,000 5,150,000
Creations (in Shares) 600,000 350,000 1,400,000
Redemptions (in Shares) (1,050,000) (550,000) (1,150,000)
Closing balance (in Shares) 4,750,000 5,200,000 5,400,000
Opening balance   $ 715,960 $ 770,400
Creations $ 62,044 47,428 210,808
Redemptions $ (103,816) $ (69,738) (162,799)
Adjustment to redemption value     (102,449)
Closing balance     $ 715,960
Redemption value per Share at period end (in Dollars per share)     $ 132.59