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Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
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) |  | 2019 |  | 2018
Revolving credit agreement with borrowings outstanding at an end of period interest rate of 3.43% in 2019 and 3.69% in 2018 (including the effect of interest rate hedging transactions, as described below), due in 2022 |  | $424,000 |  | $499,000
Finance obligation |  | — |  | 25,886
Other debt, at an average end of period rate of 5.50% in both 2019 and 2018, due in varying amounts through 2021 |  | 29 |  | 45
Long-term debt |  | 424,029 |  | 524,931
Less: current portion |  | (20) |  | (1,224)
Long-term debt, net of current portion |  | $424,009 |  | $523,707

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