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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands
Jun. 30, 2011
Derivative financial instrument assets (note 15) $ 1,802
Total recurring assets fair value 1,802
Significant Other Observable Inputs (Level 2) [Member]
 
Derivative financial instrument assets (note 15) 1,802
Total recurring assets fair value $ 1,802