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Statement of Changes in Shareholders' Deficit (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Statement of Changes in Shareholders' Deficit [Abstract]          
Shareholders’ deficit - opening balance     $ (52,982) [1],[2]    
Net gain for the period 2,812 37,075 7,573 (2,289)  
Adjustment of redeemable Shares to redemption value     (18,252)   (27,685)
Shareholders’ deficit – closing balance $ (63,661) [1]   $ (63,661) [1]   $ (52,982) [1],[2]
[1] Authorized share capital is unlimited with no par value per Share. Shares issued and outstanding at September 30, 2013 were 7,800,000 and at December 31, 2012 were
[2] Derived from audited Statement of Financial Condition as of December 31, 2012.