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Debt (Tables)
9 Months Ended
Sep. 27, 2020
Components of Convertible Senior Notes
The below tables represent the key components of Teradyne’s convertible senior notes:
 
    
September 27,
2020
    
December 31,
2019
 
    
(in thousands)
 
Debt Principal
   $ 459,973      $ 460,000  
Unamortized discount
     53,795        65,313  
  
 
 
    
 
 
 
Net Carrying amount of convertible debt
   $ 406,178      $ 394,687  
  
 
 
    
 
 
 
 
    
For the Three Months
Ended
    
For the Nine Months
Ended
 
    
September 27,
2020
    
September 29,
2019
    
September 27,
2020
    
September 29,
2019
 
    
(in thousands)
    
(in thousands)
 
Contractual interest expense on the coupon
   $ 1,438      $ 1,438      $ 4,313      $ 4,313  
Amortization of the discount component and debt issue fees recognized as interest expense
     3,887        3,699        11,518        10,961  
  
 
 
    
 
 
    
 
 
    
 
 
 
Total interest expense on the convertible debt
   $ 5,325      $ 5,137      $ 15,831      $ 15,274