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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2019
Carrying Value of Convertible Senior Notes
The carrying value of the Company’s convertible senior notes is as follows:
                 
 
December 31,
 
 
2019
 
  
2018
 
 
(Amounts in thousands)
 
0.375% convertible senior notes due 2024:
 
 
 
  
 
 
Principal amount
  $
287,500
    $
—  
  
Unamortized debt discount
   
(47,921
 )    
—  
  
Unamortized debt issuance costs
   
(6,812
 )    
—  
  
2.125% convertible senior notes due 2021:
 
 
 
  
 
 
Principal amount
   
—  
      
114,989
 
Unamortized debt discount
   
—  
      
(9,781
 )
Unamortized debt issuance costs
   
—  
      
(1,720
 )
                 
Total convertible senior notes
  $
232,767
    $
103,488
 
                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Convertible Notes Equity Component
The net carrying value of the equity component of the 2019 Notes is as follows (amounts in thousands):
         
 
December 31,
 
 
2019
 
Proceeds allocated to the conversion feature
  $
52,062
 
Less: transaction costs allocated to the conversion feature
   
(1,621
 )
Less: deferred taxes
   
(11,371
 )
         
Net carrying value
  $
39,070