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Long-Term Debt (Tables)
 9 Months Ended
Oct. 03, 2020
Long-Term Debt [Abstract]  
Long-term Debt Instruments
Long-term debt consists of the following:

  
October 3, 2020
    
December 31, 2019
  
             
Credit facility
  
$
-
    
$
-
  
Convertible senior notes, due 2025
    
403,345
      
509,128
  
Convertible senior debentures, due 2040
    
129
      
126
  
Convertible senior debentures, due 2041
    
1,065
      
6,677
  
Deferred financing costs
    
(12,249
)
    
(16,784
)
     
392,290
      
499,147
  
Less current portion
    
-
      
-
  
   
$
392,290
    
$
499,147
  
Key Facts and Terms of the Convertible Debt Instruments
The following table summarizes some key facts and terms regarding the outstanding convertible debt instruments as of October 3, 2020:

  
Convertible
Senior Notes
Due 2025
    
Convertible
Senior
Debentures
Due 2040
    
Convertible
Senior
Debentures
Due 2041
  
Issuance date
  
June 12, 2018
    
November 9, 2010
    
May 13, 2011
  
Maturity date
  
June 15, 2025
    
November 15, 2040
    
May 15, 2041
  
Principal amount as of October 3, 2020
  
$
465,344
    
$
300
    
$
2,640
  
Cash coupon rate (per annum)
    
2.25
%
    
2.25
%
    
2.25
%
Nonconvertible debt borrowing rate at issuance (per annum)
    
5.50
%
    
8.00
%
    
8.375
%
Conversion rate effective September 10, 2020 (per $1 principal amount)
    
31.8674
      
81.4200
      
59.4161
  
Effective conversion price effective September 10, 2020 (per share)
  
$
31.38
    
$
12.28
    
$
16.83
  
130% of the conversion price (per share)
  
$
40.79
    
$
15.96
    
$
21.88
  
Call date
    
n/a
    
November 20, 2020
    
May 20, 2021
  
Liability and Equity of Component of Convertible Debt Instruments
The carrying values of the liability and equity components of the convertible debt instruments are reflected in the Company’s consolidated condensed balance sheets as follows:

  
Principal
amount of the
debt
instruments
    
Unamortized
discount
    
Carrying
value of
liability
component
    
Equity
component
(including
temporary
equity) -net
carrying value
  
October 3, 2020
                        
Convertible senior notes due 2025
  
$
465,344
      
(61,999
)
  
$
403,345
    
$
66,127
  
Convertible senior debentures due 2040 and due 2041
  
$
2,940
      
(1,746
)
  
$
1,194
    
$
1,216
  
Total
  
$
468,284
    
$
(63,745
)
  
$
404,539
    
$
67,343
  
                                 
December 31, 2019
                                
Convertible senior notes due 2025
  
$
600,000
      
(90,872
)
  
$
509,128
    
$
85,262
  
Convertible senior debentures due 2040 and due 2041
  
$
17,190
      
(10,387
)
  
$
6,803
    
$
7,129
  
Total
  
$
617,190
    
$
(101,259
)
  
$
515,931
    
$
92,391
  
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 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
  
                                 
September 28, 2019
                                
Convertible senior notes due 2025
  
$
3,375
      
3,520
      
454
    
$
7,349
  
Convertible senior debentures
  
$
118
      
53
      
(8
)
  
$
163
  
Total
  
$
3,493
    
$
3,573
    
$
446
    
$
7,512
  
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 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
  
                                 
September 28, 2019
                                
Convertible senior notes due 2025
  
$
10,125
      
10,388
      
1,362
    
$
21,875
  
Convertible senior debentures
  
$
385
      
170
      
(26
)
  
$
529
  
Total
  
$
10,510
    
$
10,558
    
$
1,336
    
$
22,404