Debt (Tables)

6 Months Ended

Jun. 29, 2014

Components of Convertible Senior Notes

The tables below represent the components of Teradyne’s convertible senior notes:

	June 29, 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 and six months ended June 29, 2014 and June 30, 2013 was as follows:

	For the Three Months Ended				For the Six Months Ended
	June 29, 2014		June 30, 2013		June 29, 2014		June 30, 2013
	(in thousands)
Contractual interest expense	$	—	$	2,137	$	1,757	$	4,274
Amortization of the discount component and debt issue fees		—		4,087		4,493		8,044
Total interest expense on the convertible debt	$	—	$	6,224	$	6,250	$	12,318