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Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2020
Long-term Debt and Lease Obligation [Abstract]  
Schedule of Long-Term Debt
Long-term debt, principally to banks and noteholders, consists of:
(in thousands, except interest rates)
20202019
Revolving credit agreement with borrowings outstanding at an end of period interest rate of 3.50% in 2020 and 3.43% in 2019 (including the effect of interest rate hedging transactions, as described below), due in 2024
$398,000 $424,000 
Other debt, at an average end of period rate of 5.50% in both 2020 and 2019, due in varying amounts through 2021
9 29 
Long-term debt
398,009 424,029 
Less: current portion
(9)(20)
Long-term debt, net of current portion
$398,000 $424,009