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Note 10 - Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2015
Debt Instrument [Line Items] |
Schedule of Long-term Debt Instruments [Table Text Block] | The carrying value of our long-term debt at June 30, 2015 and December 31, 2014 was as follows:
(In thousands) |  | June 30, 2015 |  | December 31, 2014
9.000% | Senior Notes due 2017 | $ | 191,256 |  |  | $ | 190,245 |
3.000% | Convertible Senior Notes due 2017 | 51,917 |  |  | 371,336 |
2.250% | Convertible Senior Notes due 2019 | 342,980 |  |  | 336,133 |
5.500% | Senior Notes due 2019 | 295,198 |  |  | 294,585 |
5.250% | Senior Notes due 2020 | 343,541 |  |  | — |
| Total long-term debt | $ | 1,224,892 |  |  | $ | 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) | June 30, 2015 |  | December 31, 2014 |  | June 30, 2015 |  | December 31, 2014
Liability component: |  |  |  |  |  |  |
Principal | $ | 60,914 |  |  | $ | 450,000 |  |  | $ | 399,992 |  |  | $ | 400,000 |
Debt discount, net (1) | (8,546 | ) |  | (74,690 | ) |  | (51,793 | ) |  | (57,989 | )
Debt issuance costs (1) | (451 | ) |  | (3,974 | ) |  | (5,219 | ) |  | (5,878 | )
Net carrying amount | $ | 51,917 |  |  | $ | 371,336 |  |  | $ | 342,980 |  |  | $ | 336,133 |
Equity component of currently redeemable convertible senior notes | $ | 8,546 |  |  | $ | 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 June 30, |  | Six Months Ended June 30,
($ in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014
Contractual interest expense | $ | 3,122 |  |  | $ | 3,375 |  |  | $ | 6,497 |  |  | $ | 6,750 |
Amortization of debt issuance costs | 298 |  |  | 304 |  |  | 616 |  |  | 604 |
Amortization of debt discount | 5,394 |  |  | 5,312 |  |  | 11,102 |  |  | 10,498 |
Total interest expense | $ | 8,814 |  |  | $ | 8,991 |  |  | $ | 18,215 |  |  | $ | 17,852 |
| Convertible Senior Notes due 2019
| Three Months Ended June 30, |  | Six Months Ended June 30,
($ in thousands) | 2015 |  | 2014 |  | 2015 |  | 2014
Contractual interest expense | $ | 2,250 |  |  | $ | 2,250 |  |  | $ | 4,500 |  |  | $ | 4,500 |
Amortization of debt issuance costs | 330 |  |  | 319 |  |  | 658 |  |  | 635 |
Amortization of debt discount | 3,123 |  |  | 2,934 |  |  | 6,196 |  |  | 5,823 |
Total interest expense | $ | 5,703 |  |  | $ | 5,503 |  |  | $ | 11,354 |  |  | $ | 10,958 |
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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