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Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Components of Convertible Senior Notes The below tables represents the key components of Teradyne’s convertible senior notes:
                 
 
December 31,
2019
 
  
December 31,
2018
 
 
(in thousands)
 
Debt
p
rincipal
  $
460,000
    $
460,000
 
Unamortized discount
   
65,313
     
80,019
 
                 
Net
c
arrying amount of convertible debt
  $
394,687
    $
379,981
 
                 
 
 
 
 
 
 
 
 
 
 
                 
 
For the year ended
 
 
December 31,
2019
 
  
December 31,
2018
 
 
(in thousands)
 
Contractual interest expense on the coupon
  $
5,750
    $
5,750
 
Amortization of the discount component and debt issue fees recognized as interest expense
   
14,706
     
13,995
 
                 
Total interest expense on the convertible debt
  $
20,456
    $
19,745