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Financing Arrangements (Narrative) (Details)
€ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
May 31, 2023
USD ($)
Jul. 31, 2022
USD ($)
Mar. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Total unused credit lines and overdraft facilities $ 129,792,000        
Unsecured Debt | Scenario, Forecast          
Debt Instrument [Line Items]          
Amount due on long-term note   $ 15,438,000      
Unsecured Debt | Interest rate swap          
Debt Instrument [Line Items]          
Fixed interest rate swap 2.85%     2.85%  
Unsecured Debt | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Variable interest rate 1.20%        
Secured Debt          
Debt Instrument [Line Items]          
Amount due on long-term note $ 18,912,000        
Current portion of long-term note $ 2,641,000        
Fixed interest rate swap 2.74%     2.74%  
Secured Debt | Scenario, Forecast          
Debt Instrument [Line Items]          
Amount due on long-term note     $ 15,375,000    
Long-term notes | Unsecured Debt          
Debt Instrument [Line Items]          
Amount due on long-term note $ 18,109,000        
Current portion of long-term note 1,187,000        
U.S. line-of-credit          
Debt Instrument [Line Items]          
Line of credit 0       $ 0
Guarantees issued 3,293,000       3,300,000
Euro line-of-credit          
Debt Instrument [Line Items]          
Line of credit 0       0
Guarantees issued 2,895,000       3,424,000
Euro overdraft facility          
Debt Instrument [Line Items]          
Line of credit 0       $ 0
Letter of Credit | U.S. line-of-credit          
Debt Instrument [Line Items]          
Borrowing capacity 75,000,000        
Letter of Credit | Euro line-of-credit          
Debt Instrument [Line Items]          
Borrowing capacity 58,635,000     € 50,000  
Letter of Credit | Euro overdraft facility          
Debt Instrument [Line Items]          
Borrowing capacity $ 2,345,000     € 2,000