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Fair Value Measurement (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Jun. 30, 2016
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instrument asset $ 792 $ 273
Total recurring assets fair value 12,631 20,547
Significant other observable inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative financial instrument asset 792 273
Total recurring assets fair value 12,631 20,547
Corporate Bond Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments 11,839 20,274
Corporate Bond Securities | Significant other observable inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term investments $ 11,839 $ 20,274