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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2020
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, 2020December 31, 2019
Revolving credit agreement with borrowings outstanding at an end of period interest rate of 3.11% in 2020 and 3.43% in 2019 (including the effect of interest rate hedging transactions, as described below), due in 2022$435,000  $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
17  29  
Long-term debt
435,017  424,029  
Less: current portion
(17) (20) 
Long-term debt, net of current portion
$435,000  $424,009