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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2021
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, 2021December 31, 2020
Revolving credit agreement with borrowings outstanding at an end of period interest rate of 3.74% in 2021 and 3.50% in 2020 (including the effect of interest rate hedging transactions, as described below), due in 2024
$350,000 $398,000 
Other debt, at an average end of period rate of 5.50% in 2020, paid in varying amounts through April 2021
 
Long-term debt350,000 398,009 
Less: current portion
 (9)
Long-term debt, net of current portion$350,000 $398,000