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


	July 2, 2017		December 31, 2016
	(in thousands)
Debt Principal	$	460,000	$	460,000
Unamortized discount		100,755		107,331

Net Carrying amount of convertible debt	$	359,245	$	352,669


	For the Three Months Ended July 2, 2017		For the Six Months Ended July 2, 2017
	For the Three Months Ended July 2, 2017		For the Six Months Ended July 2, 2017
	(in thousands)
Contractual interest expense on the coupon	$	1,438	$	2,875
Amortization of the discount component and debt issue fees recognized as interest expense		3,308		6,576

Total interest expense on the convertible debt	$	4,746	$	9,451