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Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets $ 212 $ 359
Total assets at fair value 212 359
Derivatives Liabilities 1,253 910
Total liabilities at fair value 1,253 910
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivatives Assets 212 359
Total assets at fair value 212 359
Derivatives Liabilities 1,253 910
Total liabilities at fair value 1,253 910
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total liabilities at fair value $ 0 $ 0