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Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Schedule of Long-Term Debt | Long-term debt, principally to banks and noteholders, consists of:
(in thousands, except interest rates) | June 30, 2019 | December 31, 2018
Revolving credit agreement with borrowings outstanding at an end of period interest rate of 3.57% in 2019 and 3.69% in 2018 (including the effect of interest rate hedging transactions, as described below), due in 2022 | $482,000 | $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 | 38 | 45
Long-term debt | 482,038 | 524,931
Less: current portion | (19) | (1,224)
Long-term debt, net of current portion | $482,019 | $523,707

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