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Derivatives (Detail Textuals) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jul. 31, 2017
Derivative [Line Items]      
Maximum maturity period for Foreign Currency Derivatives Jun. 30, 2020    
Other current assets      
Derivative [Line Items]      
Fair values of total foreign currency derivatives outstanding $ 405 $ 71  
Interest rate swap      
Derivative [Line Items]      
Derivative, notional amount $ 150,000 $ 150,000 $ 150,000
Percentage of interest rate 1.8325% 1.8325% 1.8325%
Cash flow hedges | Cost of goods sold      
Derivative [Line Items]      
Realized gains related to matured contracts recorded as a component of inventory   $ 1,084