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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 $ (301,078) $ (186,817) $ (8,648)
Net gain / (loss) from operations 14,523 10,873 (1,792)
Adjustment of redeemable Shares to redemption value (82,207) (125,134) (176,377)
Shareholders’ deficit - closing balance $ (368,762) $ (301,078) $ (186,817)