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Short-Term Borrowings and Long-Term Debt (Long-term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Debt Instrument [Line Items]    
Current portion of long-term debt $ 551 $ 0
Long term debt, net of current portion 4,878 5,429
Borrowings under revolving credit facility 244,000 91,871
Total debt 249,429 97,300
Industrial Development Revenue Bond [Member]    
Debt Instrument [Line Items]    
Current portion of long-term debt 551 0
Long term debt, net of current portion 4,878 5,429
Multi-Currency Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Borrowings under revolving credit facility $ 244,000 $ 91,871