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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative financial instrument asset (liabilities) (note 15) $ 1,296
Total recurring assets fair value 1,296
Quoted prices in active markets for identical assets/(liabilities) (Level 1) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative financial instrument asset (liabilities) (note 15)   
Total recurring assets fair value   
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) 1,296
Total recurring assets fair value 1,296
Significant unobservable inputs (Level 3) [Member]
 
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Derivative financial instrument asset (liabilities) (note 15)   
Total recurring assets fair value