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Debt (Tables)
12 Months Ended
Dec. 31, 2018
Components of Convertible Senior Notes
The below tables represents the key components of Teradyne’s convertible senior notes:
 
 
 
December 31,
2018
 
 
December 31,
2017
 
 
 
(in thousands)
 
Debt principal
 
$
460,000
 
 
$
460,000
 
Unamortized discount
 
 
80,019
 
 
 
94,013
 
Net carrying amount of convertible debt
 
$
379,981
 
 
$
365,987
 
 
 
 
For the year ended
 
 
 
December 31,
2018
 
 
December 31,
2017
 
 
 
(in thousands)
 
Contractual interest expense on the coupon
 
$
5,750
 
 
$
5,734
 
Amortization of the discount component and debt issue fees recognized as interest expense
 
 
13,995
 
 
 
13,318
 
Total interest expense on the convertible debt
 
$
19,745
 
 
$
19,052