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Other Operational Loss - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2010
Other Operational Loss [Line Items]      
Percentage Of Future Proceeds Sold     45.00%
Other operational loss (Note 10) $ 0 $ 4,050