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Note 12 - Long-term Debt - Long-term Debt and Convertible Debentures (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Senior Notes | $ 150,000 |
Capital leases maturing at various dates through 2026 | 10,898 |
Other long-term debt maturing at various dates up to 2023 | 2,956 |
Long-term Debt and Lease Obligation, Including Current Maturities, Total | 589,604 |
Less: current portion | 56,478 | $ 5,545
Long-term debt - non-current | 533,126 | $ 761,078
Revolving Credit Facility [Member] |  |
Credit Agreement | $ 425,750 |

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