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Convertible Senior Notes (Tables)
 6 Months Ended
Jun. 30, 2019
Carrying Value of Convertible Senior Notes The carrying value of the Company’s convertible senior notes is as follows:
                 
 
As of
 
 
June 30,
   
December 31,
 
 
2019
   
2018
 
 
(Amounts in thousands)
 
2.125% convertible senior notes due 2021:
   
     
 
Principal amount
  $
114,972
    $
114,989
 
Unamortized debt discount
   
(7,882
 )    
(9,781
 )
Unamortized debt issuance costs
   
(1,386
 )    
(1,720
 )
                 
Total convertible senior notes
  $
105,704
    $
103,488