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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Long-Term Debt [Abstract]  
Long-term debt instruments
Long-term debt consists of the following:

   
December 31,
2020
    
December 31,
2019
  
             
Credit facility
  
$
-
    
$
-
  
Convertible senior notes, due 2025
    
406,268
      
509,128
  
Convertible senior debentures, due 2040
    
130
      
126
  
Convertible senior debentures, due 2041
    
-
      
6,677
  
Deferred financing costs
    
(11,512
)
    
(16,784
)
     
394,886
      
499,147
  
Less current portion
    
-
      
-
  
 
  
$
394,886
    
$
499,147
  
Key terms of the convertible debt instruments
The following table summarizes some key facts and terms regarding the outstanding convertible debt instruments as of December 31, 2020:

  
Due 2025
    
Due 2040
  
Issuance date
  
June 12, 2018
    
November 9, 2010
  
Maturity date
  
June 15, 2025
    
November 15, 2040
  
Principal amount
  
$
465,344
    
$
300
  
Cash coupon rate (per annum)
    
2.25
%
    
2.25
%
Nonconvertible debt borrowing rate at issuance (per annum)
    
5.50
%
    
8.00
%
Conversion rate effective December 10, 2020 (per $1 principal amount)
    
31.8836
      
81.8143
  
Effective conversion price effective December 10, 2020 (per share)
  
$
31.36
    
$
12.22
  
130% of the conversion price (per share)
  
$
40.77
    
$
15.89
  
Initial call date
    
n/a
    
November 20, 2020
  
Liability and equity components of the convertible debt instruments
The carrying values of the liability and equity components of the convertible debt instruments are reflected in the Company’s accompanying consolidated balance sheets as follows:

   
Principal
amount of the
convertible
debt
    
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
  
$
300
      
(170
)
  
$
130
    
$
121
  
Total
  
$
465,644
    
$
(59,246
)
  
$
406,398
    
$
66,248
  
                                 
December 31, 2019
                                
Convertible senior notes due 2025
  
$
600,000
      
(90,872
)
  
$
509,128
    
$
85,262
  
Convertible senior debentures
  
$
17,190
      
(10,387
)
  
$
6,803
    
$
7,129
  
Total
  
$
617,190
    
$
(101,259
)
  
$
515,931
    
$
92,391
  
Convertible Debt Interest Expense
Interest expense related to the convertible debt instruments is reflected on the accompanying consolidated statements of operations for the years ended December 31:

 
 
  
Contractual
coupon
interest
    
Non-cash
amortization
of debt
discount
    
Other non-cash
interest expense
    
Total interest
expense
related to the
debentures
  
                         
2020
                        
Convertible senior notes due 2025
  
$
12,097
      
13,118
      
1,623
    
$
26,838
  
Convertible senior debentures
  
$
88
      
43
      
-
    
$
131
  
Total
  
$
12,185
    
$
13,161
    
$
1,623
    
$
26,969
  
                                 
2019
                                
Convertible senior notes due 2025
  
$
13,500
      
13,925
      
1,816
    
$
29,241
  
Convertible senior debentures
  
$
498
      
221
      
(35
)
  
$
684
  
Total
  
$
13,998
    
$
14,146
    
$
1,781
    
$
29,925
  
                                 
2018
                                
Convertible senior notes due 2025
  
$
7,463
      
7,240
      
1,059
    
$
15,762
  
Convertible senior debentures
    
8,627
      
3,529
      
254
      
12,410
  
Total
  
$
16,090
    
$
10,769
    
$
1,313
    
$
28,172