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Note 9 - Debt, Credit Facilities and Leases - Annual Future Obligations Related to the Senior Notes (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
2020 (interest only) | $ 36,223 |
2021 (principal and interest) | 575,673 |
Total | 611,896 |
Less: interest | (75,465) |
Principal | 536,431 |
Less: unamortized discount | (2,708) |
Long-term debt | 533,723 | $ 532,799
Senior Notes [Member] |  |
2020 (interest only) | 34,822 |
2021 (principal and interest) | 544,224 |
Total | 579,046 |
Less: interest | (72,546) |
Principal | 506,500 |
Less: unamortized discount | (2,708) |
Long-term debt | 503,792 |
Series 2018-A Senior Notes [Member] |  |
2020 (interest only) | 1,401 |
2021 (principal and interest) | 31,449 |
Total | 32,850 |
Less: interest | (2,919) |
Principal | 29,931 |
Less: unamortized discount |  |
Long-term debt | $ 29,931 |

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 including interest issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second 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, after unamortized (discount) premium and debt issuance costs, of long-term debt including interest. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References No definition available. + Details
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