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Convertible Notes (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Schedule of convertible notes | The Company’s convertible notes are shown in the following table.
(Dollars in thousands) | As of December 31, 2017 |  | As of December 31, 2016
1.375% Convertible Senior Notes due 2023 | $ | 172,500 |  |  | $ | — |
1.125% Convertible Senior Notes due 2018 | 81,207 |  |  | 138,000 |
Total principal amount of convertible notes | 253,707 |  |  | 138,000 |
Unamortized discount - 2023 Notes | (34,506 | ) |  | — |
Unamortized discount - 2018 Notes | (2,547 | ) |  | (10,913 | )
Unamortized debt issuance costs - 2023 Notes | (2,547 | ) |  | — |
Unamortized debt issuance costs - 2018 Notes | (209 | ) |  | (920 | )
Total convertible notes | $ | 213,898 |  |  | $ | 126,167 |
Less current portion | 78,451 |  |  | — |
Total long-term convertible notes | $ | 135,447 |  |  | $ | 126,167 |
Schedule of interest expense on notes | Interest expense related to the notes for the years ended December 31, 2017, 2016 and 2015 was as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
2023 Notes coupon interest at a rate of 1.375% | $ | 290 |  |  | $ | — |  |  | $ | — |
2023 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 4.9% | 768 |  |  | — |  |  | — |
2018 Notes coupon interest at a rate of 1.125% | 1,488 |  |  | 1,553 |  |  | 1,567 |
2018 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 5.5% | 6,810 |  |  | 6,749 |  |  | 6,372 |
Total interest expense on convertible notes | $ | 9,356 |  |  | $ | 8,302 |  |  | $ | 7,939 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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