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Long-Term Debt (Tables)
 9 Months Ended
Sep. 29, 2018
Debt Instrument [Line Items]  
Schedule of long-term debt instruments
Long-term debt consists of the following:

  
September 29, 2018
  
December 31, 2017
 
       
Credit facility
 
$
-
  
$
150,000
 
Convertible senior debentures, due 2040
  
22,486
   
110,412
 
Convertible senior debentures, due 2041
  
57,695
   
56,641
 
Convertible senior debentures, due 2042
  
34,268
   
62,518
 
Convertible notes, due 2025
  
491,853
   
-
 
Deferred financing costs
  
(17,716
)
  
(9,101
)
   
588,586
   
370,470
 
Less current portion
  
-
   
-
 
  
$
588,586
  
$
370,470
 
Convertible Senior Notes, Due 2025 [Member]  
Debt Instrument [Line Items]  
Convertible debentures, interest expense
Interest expense for the fiscal quarter and nine fiscal months ended September 29, 2018 related to the convertible notes due 2025 is reflected on the consolidated condensed statements of operations as follows:

  
Contractual
coupon interest
  
Non-cash amortization of debt discount
  
Non-cash amortization of deferred financing costs
  
Total interest expense related to the debentures
 
Fiscal quarter ended September 29, 2018
 
$
3,375
   
3,334
   
454
  
$
7,163
 
                 
Nine fiscal months ended September 29, 2018
 
$
4,088
   
3,890
   
605
  
$
8,583
 
Liability and equity of component of convertible senior debentures
The carrying values of the liability and equity components of the convertible notes are reflected in the Company's consolidated balance sheets as follows:

  
Principal amount of
the notes
  
Unamortized discount
  
Carrying value of liability component
  
Equity component - net carrying value
 
September 29, 2018
            
Due 2025
 
$
600,000
   
(108,147
)
 
$
491,853
  
$
85,262
 
Convertible senior debentures [Member]  
Debt Instrument [Line Items]  
Convertible debentures, interest expense
Interest expense related to the debentures 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 debentures
 
September 29, 2018
               
Due 2040
 
$
310
   
135
   
4
   
20
  
$
469
 
Due 2041
 
$
844
   
349
   
12
   
71
  
$
1,276
 
Due 2042
 
$
455
   
184
   
7
   
19
  
$
665
 
Total
 
$
1,609
  
$
668
  
$
23
  
$
110
  
$
2,410
 
                     
September 30, 2017
                    
Due 2040
 
$
1,547
   
626
   
22
   
(53
)
 
$
2,142
 
Due 2041
 
$
844
   
321
   
11
   
(21
)
 
$
1,155
 
Due 2042
 
$
844
   
312
   
13
   
(21
)
 
$
1,148
 
Total
 
$
3,235
  
$
1,259
  
$
46
  
$
(95
)
 
$
4,445
 

Interest expense related to the debentures is reflected on the consolidated condensed statements of operations for the nine 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 debentures
 
September 29, 2018
               
Due 2040
 
$
2,991
   
1,269
   
42
   
81
  
$
4,383
 
Due 2041
 
$
2,532
   
1,024
   
36
   
30
  
$
3,622
 
Due 2042
 
$
2,013
   
783
   
31
   
4
  
$
2,831
 
Total
 
$
7,536
  
$
3,076
  
$
109
  
$
115
  
$
10,836
 
                     
September 30, 2017
                    
Due 2040
 
$
4,641
   
1,841
   
66
   
(97
)
 
$
6,451
 
Due 2041
 
$
2,532
   
943
   
35
   
(13
)
 
$
3,497
 
Due 2042
 
$
2,532
   
919
   
40
   
(13
)
 
$
3,478
 
Total
 
$
9,705
  
$
3,703
  
$
141
  
$
(123
)
 
$
13,426
 
Liability and equity of component of convertible senior debentures
The carrying values of the liability and equity components of the convertible debentures are reflected in the Company's consolidated condensed balance sheets as follows:

  
Principal amount of
the debentures
  
Unamortized discount
  
Embedded derivative
  
Carrying value of liability component
  
Equity component (including temporary equity) - net carrying value
 
September 29, 2018
               
Due 2040
 
$
55,000
   
(32,561
)
  
47
  
$
22,486
  
$
22,019
 
Due 2041
 
$
150,000
   
(92,549
)
  
244
  
$
57,695
  
$
62,246
 
Due 2042
 
$
80,940
   
(46,735
)
  
63
  
$
34,268
  
$
31,229
 
Total
 
$
285,940
  
$
(171,845
)
 
$
354
  
$
114,449
  
$
115,494
 
                     
December 31, 2017
                    
Due 2040
 
$
275,000
   
(164,794
)
  
206
  
$
110,412
  
$
110,094
 
Due 2041
 
$
150,000
   
(93,573
)
  
214
  
$
56,641
  
$
62,246
 
Due 2042
 
$
150,000
   
(87,600
)
  
118
  
$
62,518
  
$
57,874
 
Total
 
$
575,000
  
$
(345,967
)
 
$
538
  
$
229,571
  
$
230,214
 
Key terms of the convertible debentures
The following table summarizes some key facts and terms regarding the three series of outstanding convertible senior debentures following the adjustment made to the conversion rate of the debentures on the ex-dividend date of the September 27, 2018 dividend payment:

  
Due 2040
  
Due 2041
  
Due 2042
 
Issuance date
 
November 9, 2010
  
May 13, 2011
  
May 31, 2012
 
Maturity date
 
November 15, 2040
  
May 15, 2041
  
June 1, 2042
 
Principal amount as of September 29, 2018
 
$
55,000
  
$
150,000
  
$
80,940
 
Cash coupon rate (per annum)
  
2.25
%
  
2.25
%
  
2.25
%
Nonconvertible debt borrowing rate at issuance (per annum)
  
8.00
%
  
8.375
%
  
7.50
%
Conversion rate effective September 13, 2018 (per $1 principal amount)
  
78.0506
   
56.9573
   
91.7689
 
Effective conversion price effective September 13, 2018 (per share)
 
$
12.81
  
$
17.56
  
$
10.90
 
130% of the conversion price (per share)
 
$
16.65
  
$
22.83
  
$
14.17
 
Call date
 
November 20, 2020
  
May 20, 2021
  
June 7, 2022