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Convertible Notes (Tables) | 12 Months Ended
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Dec. 31, 2015
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, 2015 |  | As of December 31, 2014
1.125% Convertible Senior Notes due 2018 | $ | 138,000 |  |  | $ | 138,000 |
Unamortized discount - 2018 Notes | (17,099 | ) |  | (22,911 | )
Total convertible notes | $ | 120,901 |  |  | $ | 115,089 |
Less current portion | — |  |  | — |
Total long-term convertible notes | $ | 120,901 |  |  | $ | 115,089 |
Schedule of interest expense on notes | Interest expense related to the notes for the years ended December 31, 2015, 2014 and 2013 was as follows:
| Years Ended December 31,
| 2015 |  | 2014 |  | 2013
| (in thousands)
2018 Notes coupon interest at a rate of 1.125% | $ | 1,567 |  |  | $ | 1,567 |  |  | $ | 582 |
2018 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 5.5% | 6,372 |  |  | 6,019 |  |  | 2,171 |
2014 Notes coupon interest at a rate of 5% | — |  |  | 3,929 |  |  | 8,625 |
2014 Notes amortization of discount at an additional effective interest rate of 11.7% | — |  |  | 8,744 |  |  | 17,126 |
Total interest expense on convertible notes | $ | 7,939 |  |  | $ | 20,259 |  |  | $ | 28,504 |

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- Definition Tabular disclosure of the amounts of interest expense related to convertible notes during the reporting period. + References No definition available. + Details
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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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