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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     $ (16,919) [1]    
Net loss for the period (51,054) (3,411) (51,959) (2,506)  
Adjustment of redeembable Shares to redemption value     68,878   (9,201)
Shareholders’ deficit - closing balance $ 0   $ 0   $ (16,919) [1]
[1] Derived from audited Statement of Financial Condition as of December 31, 2012.