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Note 10 - Long-Term Debt (Tables) | 9 Months Ended
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Sep. 30, 2015
Debt Instrument [Line Items] |
Schedule of Long-term Debt Instruments [Table Text Block] | The carrying value of our long-term debt at September 30, 2015 and December 31, 2014 was as follows:
(In thousands) |  | September 30, 2015 |  | December 31, 2014
9.000% | Senior Notes due 2017 | $ | 191,752 |  |  | $ | 190,245 |
3.000% | Convertible Senior Notes due 2017 | 52,754 |  |  | 371,336 |
2.250% | Convertible Senior Notes due 2019 | 346,443 |  |  | 336,133 |
5.500% | Senior Notes due 2019 | 295,472 |  |  | 294,585 |
5.250% | Senior Notes due 2020 | 343,825 |  |  | — |
| Total long-term debt | $ | 1,230,246 |  |  | $ | 1,192,299 |
Schedule of Liability and Equity Components of Convertible Debt [Table Text Block] | The convertible notes are reflected on our condensed consolidated balance sheets as follows:
| Convertible Senior Notes due 2017 |  | Convertible Senior Notes due 2019
(In thousands) | September 30, 2015 |  | December 31, 2014 |  | September 30, 2015 |  | December 31, 2014
Liability component: |  |  |  |  |  |  |
Principal | $ | 60,899 |  |  | $ | 450,000 |  |  | $ | 399,992 |  |  | $ | 400,000 |
Debt discount, net (1) | (7,737 | ) |  | (74,690 | ) |  | (48,647 | ) |  | (57,989 | )
Debt issuance costs (1) | (408 | ) |  | (3,974 | ) |  | (4,902 | ) |  | (5,878 | )
Net carrying amount | $ | 52,754 |  |  | $ | 371,336 |  |  | $ | 346,443 |  |  | $ | 336,133 |
Equity component of currently redeemable convertible senior notes | $ | 7,737 |  |  | $ | 74,690 |  |  | $ | — |  |  | $ | — |
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(1) | Included within long-term debt and is being amortized over the life of the convertible notes.
Schedule of Interest Expense Recognized Related to Convertible Debt [Table Text Block] | The following tables set forth total interest expense recognized related to the convertible notes for the periods indicated:
| Convertible Senior Notes due 2017
| Three Months Ended September 30, |  | Nine Months Ended September 30,
($ in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014
Contractual interest expense | $ | 456 |  |  | $ | 3,375 |  |  | $ | 6,953 |  |  | $ | 10,125 |
Amortization of debt issuance costs | 43 |  |  | 308 |  |  | 659 |  |  | 912 |
Amortization of debt discount | 808 |  |  | 5,441 |  |  | 11,910 |  |  | 15,939 |
Total interest expense | $ | 1,307 |  |  | $ | 9,124 |  |  | $ | 19,522 |  |  | $ | 26,976 |
| Convertible Senior Notes due 2019
| Three Months Ended September 30, |  | Nine Months Ended September 30,
($ in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014
Contractual interest expense | $ | 2,250 |  |  | $ | 2,250 |  |  | $ | 6,750 |  |  | $ | 6,750 |
Amortization of debt issuance costs | 317 |  |  | 322 |  |  | 975 |  |  | 957 |
Amortization of debt discount | 3,146 |  |  | 2,980 |  |  | 9,342 |  |  | 8,803 |
Total interest expense | $ | 5,713 |  |  | $ | 5,552 |  |  | $ | 17,067 |  |  | $ | 16,510 |
Accounting Standards Update 2015-03 [Member] |
Debt Instrument [Line Items] |
Schedule of Long-term Debt Instruments [Table Text Block] | The following illustrates the impact of the reclassification:
|  | December 31, 2014
(In thousands) |  | As Previously Reported |  | Adjustment |  | As Adjusted
9.000% | Senior Notes due 2017 | $ | 192,605 |  |  | $ | (2,360 | ) |  | $ | 190,245 |
3.000% | Convertible Senior Notes due 2017 | 375,310 |  |  | (3,974 | ) |  | 371,336 |
2.250% | Convertible Senior Notes due 2019 | 342,011 |  |  | (5,878 | ) |  | 336,133 |
5.500% | Senior Notes due 2019 | 300,000 |  |  | (5,415 | ) |  | 294,585 |
| Total long-term debt | $ | 1,209,926 |  |  | $ | (17,627 | ) |  | $ | 1,192,299 |

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