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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instrument asset (note 16) $ 756 $ (3,170)
Total recurring assets fair value 756 (3,170)
Significant other observable inputs (Level 2) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instrument asset (note 16) 756 (3,170)
Total recurring assets fair value $ 756 $ (3,170)