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Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2019
Debt Disclosure [Abstract] |
Convertible Senior Notes | Convertible senior notes consist of the following (in thousands):
| June 30, 2019 |  | December 31, 2018
| Principal/ Fair Value Amount |  | Debt Issuance Costs |  | Net Amount |  | Principal/ Fair Value Amount |  | Debt Issuance Costs |  | Net Amount
4.875% convertible senior notes (due 2020) | $ | 113,000 |  |  | $ | 788 |  |  | $ | 112,212 |  |  | $ | 113,000 |  |  | $ | 1,182 |  |  | $ | 111,818 |
3.25% convertible senior notes (due 2020) * | 30,503 |  |  | — |  |  | 30,503 |  |  | 27,974 |  |  | — |  |  | 27,974 |
Total convertible senior notes, net of debt issuance costs | $ | 143,503 |  |  | $ | 788 |  |  | $ | 142,715 |  |  | $ | 140,974 |  |  | $ | 1,182 |  |  | $ | 139,792 |
* The amount presented for the 3.25% 2020 convertible senior notes within the table represents the fair value as of June 30, 2019 and December 31, 2018 (see Note 16). The principal amount of these notes totals $29.5 million as of June 30, 2019 and December 31, 2018.

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