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Convertible Notes (Tables) | 12 Months Ended
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Dec. 31, 2014
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, 2014 |  | As of December 31, 2013
1.125% Convertible Senior Notes due 2018 | $ | 138,000 |  |  | $ | 138,000 |
5% Convertible Senior Notes due 2014 | — |  |  | 172,500 |
Total principal amount of convertible notes | 138,000 |  |  | 310,500 |
Unamortized discount - 2018 Notes | (22,911 | ) |  | (28,371 | )
Unamortized discount - 2014 Notes | — |  |  | (8,453 | )
Total unamortized discount | $ | (22,911 | ) |  | $ | (36,824 | )
Total convertible notes | $ | 115,089 |  |  | $ | 273,676 |
Less current portion | — |  |  | 164,047 |
Total long-term convertible notes | $ | 115,089 |  |  | $ | 109,629 |
Schedule of interest expense on notes | Interest expense related to the notes for the years ended December 31, 2014, 2013 and 2012 was as follows:
| Years Ended December 31,
| 2014 |  | 2013 |  | 2012
| (in thousands)
2018 Notes coupon interest at a rate of 1.125% | $ | 1,567 |  |  | $ | 582 |  |  | $ | — |
2018 Notes amortization of discount and debt issuance cost at an additional effective interest rate of 5.5% | $ | 6,019 |  |  | 2,171 |  |  | — |
2014 Notes coupon interest at a rate of 5% | 3,929 |  |  | 8,625 |  |  | 8,625 |
2014 Notes amortization of discount at an additional effective interest rate of 11.7% | 8,744 |  |  | 17,126 |  |  | 14,695 |
Total interest expense on convertible notes | $ | 20,259 |  |  | $ | 28,504 |  |  | $ | 23,320 |

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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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