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Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2018
Convertible Senior Notes | Convertible senior notes consist of the following (in thousands):
|  | June 30, 2018 |  |  | December 31, 2017 |
|  | Principal/ |  |  | Debt |  |  |  |  |  | Principal/ |  |  | Debt |  |  |  |
|  | Fair Value |  |  | Issuance |  |  | Net |  |  | Fair Value |  |  | Issuance |  |  | Net |
|  | Amount |  |  | Costs |  |  | Amount |  |  | Amount |  |  | Costs |  |  | Amount |
3.25% convertible senior notes (due 2020) * |  | $ | 25,900 |  |  | $ | ― |  |  | $ | 25,900 |  |  | $ | 22,469 |  |  | $ | ― |  |  | $ | 22,469 |
4.25% convertible senior notes (due 2018) |  |  | 21,178 |  |  |  | 15 |  |  |  | 21,163 |  |  |  | 21,178 |  |  |  | 103 |  |  |  | 21,075 |
4.875% convertible senior notes (due 2020) |  |  | 113,000 |  |  |  | 1,577 |  |  |  | 111,423 |  |  |  | 113,000 |  |  |  | 1,972 |  |  |  | 111,028 |
Total convertible senior notes, net of debt issuance costs |  | $ | 160,078 |  |  | $ | 1,592 |  |  | $ | 158,486 |  |  | $ | 156,647 |  |  | $ | 2,075 |  |  | $ | 154,572 |
* The amount presented for the 3.25% 2020 convertible senior notes within the table represents the fair value as of June 30, 2018 and December 31, 2017 (see Note 16). The principal amount of these notes is $21.5 million.

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