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Debt (Tables) | 3 Months Ended
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Mar. 30, 2014
Components of Convertible Senior Notes | The tables below represent the components of Teradyne’s convertible senior notes:
|  | March 30, 2014 |  |  | December 31, 2013 |
|  | (in thousands) |
Debt principal |  | $ | — |  |  | $ | 189,998 |
Unamortized debt discount |  |  | — |  |  |  | 4,290 |
Net carrying amount of the convertible debt |  | $ | — |  |  | $ | 185,708 |
Interest Expense on Convertible Senior Notes | The interest expense on Teradyne’s convertible senior notes for the three months ended March 30, 2014 and March 31, 2013 was as follows:
|  | For the Three Months Ended |
|  | March 30, 2014 |  |  | March 31, 2013 |
|  | (in thousands) |
Contractual interest expense |  | $ | 1,757 |  |  | $ | 2,137 |
Amortization of the discount component and debt issue fees |  |  | 4,493 |  |  |  | 3,957 |
Total interest expense on the convertible debt |  | $ | 6,250 |  |  | $ | 6,094 |

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- Definition Schedule of Interest Expense Related to Convertible Debt. + References No definition available. + Details
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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + References No definition available. + Details
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