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DEBT (Tables) | 62 Months Ended
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Dec. 31, 2012
Long-Term Debt | Long-term debt at December 31, 2012 and 2011 consisted of the following:
|  | 2012 |  |  | 2011 |
|  | (in thousands) |
Convertible senior notes |  | $ | 169,896 |  |  | $ | 156,098 |
Japan loan |  |  | 3,491 |  |  |  | 6,431 |
Total debt |  |  | 173,387 |  |  |  | 162,529 |
Current portion of long-term debt |  |  | 2,328 |  |  |  | 2,573 |
Long-term debt |  | $ | 171,059 |  |  | $ | 159,956 |
Principal Payments of Debt | The debt principal payments for the next 5 years and thereafter are as follows:
Payments Due by Period |  | Debt Principal Payment |
|  | (in thousands) |
2013 |  | $ | 2,328 |
2014 |  |  | 191,163 |
2015 |  |  | — |
2016 |  |  | — |
2017 |  |  | — |
Beyond 2017 |  |  | — |
Total |  | $ | 193,491 |
Components of Convertible Senior Notes | The below tables represent the key components of Teradyne’s convertible senior notes:
|  | December 31, 2012 |  |  | December 31, 2011 |
|  | (in thousands) |
Debt principal |  | $ | 190,000 |  |  | $ | 190,000 |
Unamortized discount |  |  | 20,104 |  |  |  | 33,902 |
Net carrying amount of the convertible debt |  | $ | 169,896 |  |  | $ | 156,098 |
|  | For the year ended |
|  | December 31, 2012 |  |  | December 31, 2011 |
|  | (in thousands) |
Contractual interest expense on the coupon |  | $ | 8,550 |  |  | $ | 8,550 |
Amortization of the discount component and debt issue fees recognized as interest expense |  |  | 14,612 |  |  |  | 12,853 |
Total interest expense on the convertible debt |  | $ | 23,162 |  |  | $ | 21,403 |

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