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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Long-Term Debt [Abstract]  
Long-term debt instruments Long-term debt consists of the following:


 
December 31,
2019
    
December 31,
2018
  
             
Credit facility
  
$
-
    
$
-
  
Convertible senior notes, due 2025
    
509,128
      
495,203
  
Convertible senior debentures, due 2040
    
126
      
539
  
Convertible senior debentures, due 2041
    
6,677
      
12,812
  
Convertible senior debentures, due 2042
    
-
      
923
  
Deferred financing costs
    
(16,784
)
    
(14,968
)
     
499,147
      
494,509
  
Less current portion
    
-
      
-
  
 
  
$
499,147
    
$
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 December 31, 2019:


 
Due 2025
    
Due 2040
    
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
  
$
600,000
    
$
300
    
$
16,890
  
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 December 12, 2019 (per $1 principal amount)
    
31.8083
      
80.0018
      
58.3812
  
Effective conversion price effective December 12, 2019 (per share)
  
$
31.44
    
$
12.50
    
$
17.13
  
130% of the conversion price (per share)
  
$
40.87
    
$
16.25
    
$
22.27
  
Call date
    
n/a
    
November 20, 2020
    
May 20, 2021
  
Liability and equity components of the convertible debt instruments
The carrying values of the liability and equity components of the convertible debentures are reflected in the Company’s accompanying consolidated balance sheets as follows:

 
  
Principal
amount of the
convertible
debt
    
Unamortized
discount
    
Embedded
derivative
    
Carrying
value of
liability
component
    
Equity
component
(including
temporary
equity) - net
carrying value
  
                               
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
  
                                         
December 31, 2018
                                        
Convertible senior notes due 2025
  
$
600,000
      
(104,797
)
    
-
    
$
495,203
    
$
85,262
  
Convertible senior debentures
  
$
36,556
      
(22,352
)
    
70
    
$
14,274
    
$
15,092
  
Total
  
$
636,556
    
$
(127,149
)
  
$
70
    
$
509,477
    
$
100,354
  
Convertible Debt Interest Expense
Interest expense related to the debentures is reflected on the accompanying consolidated statements of operations for the years ended December 31:

 
 
  
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
  
                               
2019
                              
Convertible senior notes due 2025
  
$
13,500
      
13,925
      
1,816
      
-
    
$
29,241
  
Convertible senior debentures
  
$
498
      
221
      
7
      
(42
)
  
$
684
  
Total
  
$
13,998
    
$
14,146
    
$
1,823
    
$
(42
)
  
$
29,925
  
                                         
2018
                                        
Convertible senior notes due 2025
  
$
7,463
      
7,240
      
1,059
      
-
    
$
15,762
  
Convertible senior debentures
  
$
8,627
      
3,529
      
126
      
128
    
$
12,410
  
Total
  
$
16,090
    
$
10,769
    
$
1,185
    
$
128
    
$
28,172
  
                                         
2017
                                        
Convertible senior debentures
  
$
12,938
      
4,984
      
189
      
(316
)
  
$
17,795
  
Total
  
$
12,938
    
$
4,984
    
$
189
    
$
(316
)
  
$
17,795