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Statements of Changes in Shareholders' Deficit (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Statements of Changes in Shareholders' Deficit [Abstract]      
Shareholders’ deficit - opening balance $ (23,047) $ (264,285) [1] $ 0 [1]
Net (loss) / gain from operations (2,250) 83,631 12,664 [1]
Adjustment of redeemable Shares to redemption value (27,685) 157,607 (276,949) [1]
Shareholders’ deficit – closing balance $ (52,982) $ (23,047) $ (264,285) [1]
[1] Date of Inception