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Debt (Tables)
6 Months Ended
Jun. 30, 2019
Components of Convertible Senior Notes
The below tables represent the key components of Teradyne’s convertible senior notes:
                 
 
June 30,
2019
   
December 31,
2018
 
 
(in thousands)
 
Debt Principal
  $
460,000
    $
460,000
 
Unamortized discount
   
72,757
     
80,019
 
                 
Net Carrying amount of convertible debt
  $
387,243
    $
379,981
 
                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                 
 
For the Three Months
Ended
   
For the Six Months
Ended
 
 
June 30,
2019
   
July 1,
2018
   
June 30,
2019
   
July 1,
2018
 
 
(in thousands)
 
Contractual interest expense on the coupon
  $
1,438
    $
1,438
    $
2,875
    $
2,875
 
Amortization of the discount component recognized as interest expense
   
3,653
     
3,477
     
7,262
     
6,911
 
                                 
Total interest expense on the convertible debt
  $
5,091
    $
4,915
    $
10,137
    $
9,786