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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands
Sep. 30, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] 
Derivative financial instrument asset (liabilities) (note 15)$ (5,398)
Total recurring assets fair value(5,398)
Significant Other Observable Inputs (Level 2) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] 
Derivative financial instrument asset (liabilities) (note 15)(5,398)
Total recurring assets fair value$ (5,398)