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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands | Jun. 30, 2011
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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

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