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Financing Arrangements (Narrative) (Details) € in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)	May 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Sep. 30, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Total unused credit lines and overdraft facilities	$ 108,152,000
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	2.90%			2.90%
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	$ 25,207,000
Current portion of long-term note	$ 2,466,000
Fixed interest rate swap	2.70%			2.70%
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	$ 21,078,000
Current portion of long-term note	1,188,000
U.S. line-of-credit
Debt Instrument [Line Items]
Line of credit	0				$ 0
Guarantees issued	955,000				520,000
Euro line-of-credit
Debt Instrument [Line Items]
Line of credit	0				0
Guarantees issued	1,222,000				$ 798,000
Euro overdraft facility
Debt Instrument [Line Items]
Line of credit	0
Letter of Credit | U.S. line-of-credit
Debt Instrument [Line Items]
Borrowing capacity	50,000,000
Letter of Credit | Euro line-of-credit
Debt Instrument [Line Items]
Borrowing capacity	58,009,000			€ 50,000
Letter of Credit | Euro overdraft facility
Debt Instrument [Line Items]
Borrowing capacity	$ 2,320,000			€ 2,000

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