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Statement of Changes in Shareholders' Deficit (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Statement of Changes in Shareholders' Deficit [Abstract]          
Shareholders’ deficit - opening balance     $ (52,982) [1]    
Net gain / (loss) from operations 4,854 (38,733) 4,761 (39,364)  
Adjustment of redeemable Shares to redemption value     47,481   (27,685)
Shareholders’ deficit – closing balance $ (740)   $ (740)   $ (52,982) [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2012.