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Note 11 - Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2018
Senior Notes [Abstract] |
Schedule of Senior Notes [Table Text Block] | The carrying value of our senior notes at June 30, 2018 and December 31, 2017 was as follows:
(In thousands) |  | June 30, 2018 |  | December 31, 2017
5.500% | Senior Notes due 2019 | $ | 157,975 |  |  | $ | 157,636 |
5.250% | Senior Notes due 2020 | 232,275 |  |  | 231,834 |
7.000% | Senior Notes due 2021 | 195,500 |  |  | 195,146 |
4.500% | Senior Notes due 2024 | 442,937 |  |  | 442,458 |
| Total Senior Notes | $ | 1,028,687 |  |  | $ | 1,027,074 |

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