Financing Arrangements (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) creditLine	May 31, 2023 USD ($)	Jul. 31, 2022 USD ($)	Dec. 31, 2021 EUR (€) creditLine	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Long-term debt	$ 34,157,000				$ 37,967,000
Current portion of long-term debt	18,126,000				3,810,000
Long-Term Note
Line of Credit Facility [Line Items]
Current portion of long-term debt	18,126,000				$ 3,810,000
Unsecured Debt
Line of Credit Facility [Line Items]
Notes payable	17,219,000
Notes payable, current	1,188,000
Unsecured Debt | Scenario, Forecast
Line of Credit Facility [Line Items]
Notes payable		$ 15,438,000
Secured Debt
Line of Credit Facility [Line Items]
Notes payable	$ 16,938,000
Interest rate	2.74%			2.74%
Secured Debt | Scenario, Forecast
Line of Credit Facility [Line Items]
Notes payable			$ 15,375,000
London Interbank Offered Rate (LIBOR) | Unsecured Debt
Line of Credit Facility [Line Items]
Spread on variable rate	1.20%
U S Line Of Credit
Line of Credit Facility [Line Items]
Line of credit	$ 0
Guarantees issued	$ 2,478,000
US Long Term Note
Line of Credit Facility [Line Items]
Debt service coverage ratio	3.0
Maximum indebtedness against EBITDA	3
US Long Term Note | Minimum
Line of Credit Facility [Line Items]
Covenant, debt service coverage	$ 50,000,000
US Long Term Note | Maximum
Line of Credit Facility [Line Items]
Covenant, debt service coverage	500,000,000
Euro Line Of Credit
Line of Credit Facility [Line Items]
Line of credit	0
Guarantees issued	2,161,000
Other European Facilities
Line of Credit Facility [Line Items]
Borrowing capacity	$ 1,701,000			€ 1,500,000
Number of credit lines | creditLine	1			1
Letter of Credit | U S Line Of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	$ 75,000,000
Remaining borrowing capacity	$ 72,522,000
Letter of Credit | U S Line Of Credit | Minimum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Spread on variable rate	0.80%
Letter of Credit | U S Line Of Credit | Maximum | London Interbank Offered Rate (LIBOR)
Line of Credit Facility [Line Items]
Spread on variable rate	1.20%
Letter of Credit | Euro Line Of Credit
Line of Credit Facility [Line Items]
Borrowing capacity	$ 56,710,000			€ 50,000,000
Remaining borrowing capacity	54,549,000
Letter of Credit | Other European Facilities
Line of Credit Facility [Line Items]
Line of credit	0
Remaining borrowing capacity	$ 1,701,000
Interest rate swap | Unsecured Debt
Line of Credit Facility [Line Items]
Fixed interest rate	2.85%			2.85%