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Convertible Notes (Tables) | 3 Months Ended
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Mar. 31, 2014
Debt Disclosure [Abstract] |
Schedule of convertible notes | The Company’s convertible notes are shown in the following table:
(In thousands) |  | As of March 31, 2014 |  | As of December 31, 2013
5% Convertible Senior Notes due 2014 |  | $ | 172,500 |  |  | $ | 172,500 |
1.125% Convertible Senior Notes due 2018 |  | 138,000 |  |  | 138,000 |
Total principal amount of convertible notes |  | $ | 310,500 |  |  | $ | 310,500 |
Unamortized discount - 2014 Notes |  | $ | (3,842 | ) |  | $ | (8,453 | )
Unamortized discount - 2018 Notes |  | (27,038 | ) |  | (28,371 | )
Total unamortized discount |  | $ | (30,880 | ) |  | $ | (36,824 | )
Total convertible notes |  | $ | 279,620 |  |  | $ | 273,676 |
Less current portion |  | 168,658 |  |  | 164,047 |
Total long-term convertible notes |  | $ | 110,962 |  |  | $ | 109,629 |
Schedule of interest expense on notes | Interest expense related to the notes for the three months ended March 31, 2014 and 2013 was as follows:
| Three Months Ended
| March 31,
| 2014 |  | 2013
| (In thousands)
2014 Notes coupon interest at a rate of 5% | $ | 2,156 |  |  | $ | 2,157 |
2014 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 11.7% | 4,769 |  |  | 4,089 |
2018 Notes coupon interest at a rate of 1.125% | 388 |  |  | — |
2018 Notes amortization of discount and debt issuance costs at an additional effective interest rate of 5.5% | 1,473 |  |  | — |
Total interest expense on convertible notes | $ | 8,786 |  |  | $ | 6,246 |

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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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