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Short-Term Borrowings and Long-Term Debt (Schedule of Debt) (Details) - USD ($)
Sep. 30, 2019
Jun. 30, 2019
Apr. 30, 2019
Debt Instrument [Line Items]      
Short-term borrowings $ 0 $ 4,590,000  
Current portion of long-term debt 5,026,000 4,085,000  
Long-term debt 148,800,000 151,014,000  
Borrowings under revolving credit facility 216,504,000 200,817,000  
Total debt 370,330,000 360,506,000  
Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Long-term debt 144,375,000 146,250,000 $ 150,000,000
Multi-Currency Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Borrowings under revolving credit facility 216,504,000 200,817,000  
Mississippi Revenue Bond [Member]      
Debt Instrument [Line Items]      
Long-term debt $ 4,425,000 $ 4,764,000