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Convertible Senior Notes (Tables)
9 Months Ended
Sep. 30, 2018
Convertible Senior Notes
Convertible senior notes consist of the following (in thousands):

 
 
September 30, 2018
 
 
December 31, 2017
 
 
 
Principal/
 
 
Debt
     
 
Principal/
 
 
Debt
     
 
 
Fair Value
 
 
Issuance
 
 
Net
 
 
Fair Value
 
 
Issuance
 
 
Net
 
 
 
Amount
 
 
Costs
 
 
Amount
 
 
Amount
 
 
Costs
 
 
Amount
 
                                     
4.25% convertible senior notes (due 2018)
 
$
   
$
   
$
   
$
21,178
   
$
103
   
$
21,075
 
4.875% convertible senior notes (due 2020)
   
113,000
     
1,380
     
111,620
     
113,000
     
1,972
     
111,028
 
3.25% convertible senior notes (due 2020) *
   
33,436
     
     
33,436
     
22,469
     
     
22,469
 
Total convertible senior notes, net of debt issuance costs
 
$
146,436
   
$
1,380
   
$
145,056
   
$
156,647
   
$
2,075
   
$
154,572
 
             * The amount presented for the 3.25% 2020 convertible senior notes within the table represents the fair value as of September 30, 2018 and December 31, 2017 (see Note 16). The principal amount of these notes totals $29.5 million and $21.5 million as of September 30, 2018 and December 31, 2017, respectively.