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Long-Term Debt (Tables)
 9 Months Ended
Oct. 02, 2021
Long-Term Debt [Abstract]  
Long-term Debt Instruments
Long-term debt consists of the following:

  
October 2, 2021
    
December 31, 2020
  
             
Credit facility
  
$
-
    
$
-
  
Convertible senior notes, due 2025
    
465,344
      
406,268
  
Convertible senior debentures, due 2040
    
-
      
130
  
Deferred financing costs
    
(10,496
)
    
(11,512
)
     
454,848
      
394,886
  
Less current portion
    
-
      
-
  
   
$
454,848
    
$
394,886
  
Key Facts and Terms of the Convertible Debt Instruments
The following table summarizes some key facts and terms regarding the outstanding convertible senior notes due 2025 as of October 2, 2021:

  
Convertible
Senior Notes
Due 2025
  
Issuance date
  
June 12, 2018
  
Maturity date
  
June 15, 2025
  
Principal amount as of October 2, 2021
  
$
465,344
  
Cash coupon rate (per annum)
    
2.25
%
Nonconvertible debt borrowing rate at issuance (per annum)
    
5.50
%
Conversion rate effective September 9, 2021 (per $1 principal amount)
    
31.9258
  
Effective conversion price effective September 9, 2021 (per share)
  
$
31.32
  
130% of the conversion price (per share)
  
$
40.72
  
Call date
    
n/a
  
Liability and Equity of Component of Convertible Debt Instruments
The carrying value of the convertible senior notes due 2025 was $465,344 as of October 2, 2021.  The carrying value of the liability and equity components of the convertible debt instruments prior to the adoption of ASU No. 2020-06 are reflected in the Company’s consolidated condensed balance sheet as follows:

  
Principal
amount of the
debt
instruments
    
Unamortized
discount
    
Carrying
value of
liability
component
    
Equity
component
(including
temporary
equity) -net
carrying value
  
December 31, 2020
                        
Convertible senior notes due 2025
  
$
465,344
      
(59,076
)
  
$
406,268
    
$
66,127
  
Convertible senior debentures due 2040
  
$
300
      
(170
)
  
$
130
    
$
121
  
Total
  
$
465,644
    
$
(59,246
)
  
$
406,398
    
$
66,248
  
Convertible Debt Instruments, Interest Expense
Interest expense related to the convertible debt instruments is reflected on the consolidated condensed statements of operations for the fiscal quarters ended:

  
Contractual
coupon
interest
    
Non-cash
amortization
of debt
discount
    
Other non-cash
interest expense
    
Total interest
expense
related to the
debt
instruments
  
October 2, 2021
                        
Convertible senior notes due 2025
  
$
2,618
      
-
      
433
    
$
3,051
  
                                 
October 3, 2020
                                
Convertible senior notes due 2025
  
$
2,839
      
3,099
      
382
    
$
6,320
  
Convertible senior debentures
  
$
16
      
8
      
-
    
$
24
  
Total
  
$
2,855
    
$
3,107
    
$
382
    
$
6,344
  
Interest expense related to the convertible debt instruments is reflected on the consolidated condensed statements of operations for the nine fiscal months ended:

  
Contractual
coupon
interest
    
Non-cash
amortization
of debt
discount
    
Other non-cash
interest expense
    
Total interest
expense related to the
debt
instruments
  
October 2, 2021
                        
Convertible senior notes due 2025
  
$
7,854
      
-
      
1,299
    
$
9,153
  
                                 
October 3, 2020
                                
Convertible senior notes due 2025
  
$
9,480
      
10,195
      
1,271
    
$
20,946
  
Convertible senior debentures
  
$
76
      
37
      
-
    
$
113
  
Total
  
$
9,556
    
$
10,232
    
$
1,271
    
$
21,059