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Financial Instruments (Tables)
12 Months Ended
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)
20222021
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