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Long-Term Debt (Tables)
 3 Months Ended
Mar. 30, 2019
Long-Term Debt [Abstract]  
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
  
Non-cash amortization of deferred financing costs
  
Non-cash change in value of derivative liability
  
Total interest expense related to the debt instruments
 
March 30, 2019
               
Convertible senior notes due 2025
 
$
3,375
   
3,426
   
454
   
-
  
$
7,255
 
Convertible senior debentures
 
$
148
   
64
   
2
   
(18
)
 
$
196
 
Total
 
$
3,523
  
$
3,490
  
$
456
  
$
(18
)
 
$
7,451
 
                     
March 31, 2018
                    
Convertible senior notes due 2025
 
$
-
   
-
   
-
   
-
  
$
-
 
Convertible senior debentures
 
$
3,235
   
1,309
   
47
   
161
  
$
4,752
 
Total
 
$
3,235
  
$
1,309
  
$
47
  
$
161
  
$
4,752
 
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
  
Embedded derivative
  
Carrying value of liability component
  
Equity component (including temporary equity) - net carrying value
 
March 30, 2019
               
Convertible senior notes due 2025
 
$
600,000
   
(101,371
)
  
-
  
$
498,629
  
$
85,262
 
Convertible senior debentures due 2040 and due 2041
 
$
21,140
   
(12,935
)
  
24
  
$
8,229
  
$
8,767
 
Total
 
$
621,140
  
$
(114,306
)
 
$
24
  
$
506,858
  
$
94,029
 
                     
December 31, 2018
                    
Convertible senior notes due 2025
 
$
600,000
   
(104,797
)
  
-
  
$
495,203
  
$
85,262
 
Convertible senior debentures due 2040, due 2041, and due 2042
 
$
36,556
   
(22,352
)
  
70
  
$
14,274
  
$
15,092
 
Total
 
$
636,556
  
$
(127,149
)
 
$
70
  
$
509,477
  
$
100,354
 
Key terms of the convertible debt instruments
The following table summarizes some key facts and terms regarding the outstanding convertible debt instruments as of March 30, 2019:

  
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 March 30, 2019
 
$
600,000
  
$
350
  
$
20,790
 
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 March 13, 2019 (per $1 principal amount)
  
31.7536
   
78.7076
   
57.4367
 
Effective conversion price effective March 13, 2019 (per share)
 
$
31.49
  
$
12.71
  
$
17.41
 
130% of the conversion price (per share)
 
$
40.94
  
$
16.52
  
$
22.63
 
Call date
  
n/a
  
November 20, 2020
  
May 20, 2021
 
Schedule of long-term debt instruments
Long-term debt consists of the following:

  
March 30, 2019
  
December 31, 2018
 
       
Credit facility
 
$
-
  
$
-
 
Convertible senior notes, due 2025
  
498,629
   
495,203
 
Convertible senior debentures, due 2040
  
144
   
539
 
Convertible senior debentures, due 2041
  
8,085
   
12,812
 
Convertible senior debentures, due 2042
  -
   
923
 
Deferred financing costs
  
(14,028
)
  
(14,968
)
   
492,830
   
494,509
 
Less current portion
  -
   -
 
  
$
492,830
  
$
494,509