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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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