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Long-Term Debt (Tables)
 6 Months Ended
Jun. 29, 2019
Long-Term Debt [Abstract]  
Schedule of long-term debt instruments
Long-term debt consists of the following:


  
June 29, 2019
    
December 31, 2018
  
             
Credit facility
  
$
28,000
    
$
-
  
Convertible senior notes, due 2025
    
502,071
      
495,203
  
Convertible senior debentures, due 2040
    
146
      
539
  
Convertible senior debentures, due 2041
    
8,132
      
12,812
  
Convertible senior debentures, due 2042
    
-
      
923
  
Deferred financing costs
    
(18,486
)
    
(14,968
)
     
519,863
      
494,509
  
Less current portion
    
-
      
-
  
   
$
519,863
    
$
494,509
  

Key terms of the convertible debt instruments
The following table summarizes some key facts and terms regarding the outstanding convertible debt instruments as of June 29, 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 June 29, 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 June 12, 2019 (per $1 principal amount)
    
31.7738
      
79.1822
      
57.7830
  
Effective conversion price effective June 12, 2019 (per share)
  
$
31.47
    
$
12.63
    
$
17.31
  
130% of the conversion price (per share)
  
$
40.91
    
$
16.42
    
$
22.50
  
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
    
Embedded
derivative
    
Carrying
value of
liability
component
    
Equity
component
(including
temporary
equity) -net
carrying value
  
June 29, 2019
                              
Convertible senior notes due 2025
  
$
600,000
      
(97,929
)
    
-
    
$
502,071
    
$
85,262
  
Convertible senior debentures due 2040 and due 2041
  
$
21,140
      
(12,882
)
    
20
    
$
8,278
    
$
8,767
  
Total
  
$
621,140
    
$
(110,811
)
  
$
20
    
$
510,349
    
$
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
  

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
  
June 29, 2019
                              
Convertible senior notes due 2025
  
$
3,375
      
3,442
      
454
      
-
    
$
7,271
  
Convertible senior debentures
  
$
119
      
53
      
2
      
(4
)
  
$
170
  
Total
  
$
3,494
    
$
3,495
    
$
456
    
$
(4
)
  
$
7,441
  
                                         
June 30, 2018
                                        
Convertible senior notes due 2025
  
$
713
      
556
      
151
      
-
    
$
1,420
  
Convertible senior debentures
  
$
2,692
      
1,099
      
39
      
(156
)
  
$
3,674
  
Total
  
$
3,405
    
$
1,655
    
$
190
    
$
(156
)
  
$
5,094
  

Interest expense related to the convertible debt instruments is reflected on the consolidated condensed statements of operations for the six fiscal months 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
  
June 29, 2019
                              
Convertible senior notes due 2025
  
$
6,750
      
6,868
      
908
      
-
    
$
14,526
  
Convertible senior debentures due 2040 and due 2041
  
$
267
      
117
      
4
      
(22
)
  
$
366
  
Total
  
$
7,017
    
$
6,985
    
$
912
    
$
(22
)
  
$
14,892
  
                                         
June 30, 2018
                                        
Convertible senior notes due 2025
  
$
713
      
556
      
151
      
-
    
$
1,420
  
Convertible senior debentures due 2040 and due 2041
  
$
5,927
      
2,408
      
86
      
5
    
$
8,426
  
Total
  
$
6,640
    
$
2,964
    
$
237
    
$
5
    
$
9,846