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Note 3 - Long-term Debt (Tables) | 9 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Long-term Debt Instruments [Table Text Block] |
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Long-term debt including current portion: |  |  |  |  |  |  |  |
2017 Senior Credit Facility |  |  | 595,026 |  |  |  | 635,234 |
2024 Notes |  |  | 525,000 |  |  |  | 525,000 |
2026 Notes |  |  | 700,000 |  |  |  | 700,000 |
Total outstanding principal |  |  | 1,820,026 |  |  |  | 1,860,234 |
Unamortized deferred loan costs - 2017 Senior Credit Facility |  |  | (9,890 | ) |  |  | (11,777 | )
Unamortized deferred loan costs - 2024 Notes |  |  | (5,994 | ) |  |  | (6,743 | )
Unamortized deferred loan costs - 2026 Notes |  |  | (8,637 | ) |  |  | (9,473 | )
Unamortized premium - 2026 Notes |  |  | 4,729 |  |  |  | 5,187 |
Less current portion |  |  | - |  |  |  | (6,417 | )
Net carrying value |  | $ | 1,800,234 |  |  | $ | 1,831,011 |
Borrowing availability under the Revolving Credit Facility |  | $ | 100,000 |  |  | $ | 100,000 |

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