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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Long-Term Debt and Lease Obligation [Abstract] |
Schedule of Long-Term Debt | Long-term debt, principally to banks, consists of:
(in thousands, except interest rates) |  | 2022 |  | 2021
Revolving credit agreement with borrowings outstanding at an end of period interest rate of 3.16% in 2022 and 3.74% in 2021 (including the effect of interest rate hedging transactions, as described below), due in 2024 |  | $ | 439,000 |  |  | $ | 350,000 |

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