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Note 5 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 09, 2021 | Jun. 08, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Long-term debt, outstanding principal | $ 3,386,943 |  |  | $ 3,949,823
Long-term debt, unamortized discount | (382) |  |  | (472)
Long-term debt, unamortized original fees and costs | (47,011) |  |  | (51,868)
Long-term debt, net | 3,339,550 |  |  | 3,897,483
Long-term debt, outstanding principal, current | 39,324 |  |  | 30,740
Long-term debt, unamortized discount, current | 0 |  |  | 0
Long-term debt, unamortized original fees and costs, current | 0 |  |  | 0
Current maturities of long-term debt | 39,324 |  |  | 30,740
Long-term debt, outstanding principal, noncurrent | 3,347,619 |  |  | 3,919,083
Long-term debt, unamortized discount, noncurrent | (382) |  |  | (472)
Long-term debt, unamortized original fees and costs, noncurrent | (47,011) |  |  | (51,868)
Long-term debt, net of current maturities and debt issuance costs | $ 3,300,226 |  |  | $ 3,866,743
Line of Credit [Member] | Bank Credit Facility [Member] |  |  |  |
Long-term debt, interest rate | 2.471% |  |  | 2.486%
Long-term debt, outstanding principal | $ 884,648 |  |  | $ 896,185
Long-term debt, unamortized discount | (382) |  |  | (472)
Long-term debt, unamortized original fees and costs | (10,587) |  |  | (12,924)
Long-term debt, net | $ 873,679 |  |  | $ 882,789
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member] |  |  |  |
Long-term debt, interest rate | 4.75% |  |  | 4.75%
Long-term debt, outstanding principal | $ 1,000,000 |  |  | $ 1,000,000
Long-term debt, unamortized discount | 0 |  |  | 0
Long-term debt, unamortized original fees and costs | (12,662) |  |  | (13,636)
Long-term debt, net | $ 987,338 |  |  | $ 986,364
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member] |  |  |  |
Long-term debt, interest rate |  | 6.375% | 6.375% | 6.375%
Long-term debt, outstanding principal |  |  |  | $ 750,000
Long-term debt, unamortized discount |  |  |  | 0
Long-term debt, unamortized original fees and costs |  |  |  | (6,947)
Long-term debt, net |  |  |  | $ 743,053
Senior Notes [Member] | Senior Note 8.625% Due 2025 [Member] |  |  |  |
Long-term debt, interest rate | 8.625% |  |  | 8.625%
Long-term debt, outstanding principal | $ 600,000 |  |  | $ 600,000
Long-term debt, unamortized discount | 0 |  |  | 0
Long-term debt, unamortized original fees and costs | (9,322) |  |  | (10,512)
Long-term debt, net | $ 590,678 |  |  | $ 589,488
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member] |  |  |  |
Long-term debt, interest rate |  | 6.00% | 6.00% | 6.00%
Long-term debt, outstanding principal |  |  |  | $ 700,000
Long-term debt, unamortized discount |  |  |  | 0
Long-term debt, unamortized original fees and costs |  |  |  | (7,849)
Long-term debt, net |  |  |  | $ 692,151
Senior Notes [Member] | The 4.750% Senior Notes Due June 2031 [Member] |  |  |  |
Long-term debt, interest rate | 4.75% |  | 4.75% |
Long-term debt, outstanding principal | $ 900,000 |  |  |
Long-term debt, unamortized discount | 0 |  |  |
Long-term debt, unamortized original fees and costs | (14,440) |  |  |
Long-term debt, net | $ 885,560 |  |  |
Other Long-Term Debt [Member] |  |  |  |
Long-term debt, interest rate | 6.184% |  |  | 6.137%
Long-term debt, outstanding principal | $ 2,295 |  |  | $ 3,638
Long-term debt, unamortized discount | 0 |  |  | 0
Long-term debt, unamortized original fees and costs | 0 |  |  | 0
Long-term debt, net | $ 2,295 |  |  | $ 3,638

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