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Note 7 - Debt, Credit Facilities and Capital Leases - Annual Future Obligations Related to the Senior Notes (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
2019 | $ 36,194 |
2020 | 36,194 |
2021 | 547,885 |
Total | 620,273 |
Less: interest | (84,453) |
Principal | 535,820 |
Less: unamortized discount | (3,021) |
Long-term debt | 532,799 | $ 502,229
Senior Notes [Member] |  |
2019 | 34,822 |
2020 | 34,822 |
2021 | 518,107 |
Total | 587,751 |
Less: interest | (81,251) |
Principal | 506,500 |
Less: unamortized discount | (3,021) |
Long-term debt | 503,479 |
Series 2018-A Senior Notes [Member] |  |
2019 | 1,372 |
2020 | 1,372 |
2021 | 29,778 |
Total | 32,522 |
Less: interest | (3,202) |
Principal | 29,320 |
Less: unamortized discount |  |
Long-term debt | $ 29,320 |

X
- Definition Amount of long-term debt payable, sinking fund requirements, and other securities including interest issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued including interest that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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