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Derivative Instruments - Fair Value of Derivative Instruments on the Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Designated as Cash Flow Hedges | Short-term Investments | Cash Flow Hedging    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value $ 5 $ 0
Designated as Cash Flow Hedges | Short-Term Derivative Liabilities | Cash Flow Hedging    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 2,661 3,081
Designated as Cash Flow Hedges | Long-term derivative liabilities | Cash Flow Hedging    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 322 386
Not Designated as Hedging Instrument | Short-term Investments    
Derivatives, Fair Value [Line Items]    
Derivative asset, fair value 12 0
Not Designated as Hedging Instrument | Short-Term Derivative Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value 1,557 219
Not Designated as Hedging Instrument | Long-term derivative liabilities    
Derivatives, Fair Value [Line Items]    
Derivative liability, fair value $ 0 $ 0