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Debt (Tables) | 9 Months Ended
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Sep. 29, 2013
Components of Convertible Senior Notes | The tables below represent the components of Teradyne’s convertible senior notes:
|  | September 29, 2013 |  |  | December 31, 2012 |
|  | (in thousands) |
Debt principal |  | $ | 189,998 |  |  | $ | 190,000 |
Unamortized debt discount |  |  | 8,448 |  |  |  | 20,104 |
Net carrying amount of the convertible debt |  | $ | 181,550 |  |  | $ | 169,896 |
Interest Expense on Convertible Senior Notes | The interest expense on Teradyne’s convertible senior notes for the three and nine months ended September 29, 2013 and September 30, 2012 was as follows:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 29, 2013 |  |  | September 30, 2012 |  |  | September 29, 2013 |  |  | September 30, 2012 |
|  | (in thousands) |
Contractual interest expense |  | $ | 2,114 |  |  | $ | 2,114 |  |  | $ | 6,388 |  |  | $ | 6,413 |
Amortization of the discount component and debt issue fees |  |  | 4,221 |  |  |  | 3,710 |  |  |  | 12,266 |  |  |  | 10,781 |
Total interest expense on the convertible debt |  | $ | 6,335 |  |  | $ | 5,824 |  |  | $ | 18,654 |  |  | $ | 17,194 |

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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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