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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt, principally to banks and noteholders, consists of:
(in thousands, except interest rates)
June 30, 2022December 31, 2021
Revolving credit agreement with borrowings outstanding at an end of period interest rate of 3.52% in 2022 and 3.74% in 2021 (including the effect of interest rate hedging transactions, as described below), due in 2024
$485,000 $350,000