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Convertible Senior Notes (Tables)
6 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Convertible Senior Notes
Convertible senior notes consist of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
 
Principal/
Fair Value
Amount
 
Debt
Issuance
Costs
 
Net
Amount
 
Principal/
Fair Value
Amount
 
Debt
Issuance
Costs
 
Net
Amount
4.875% convertible senior notes (due 2020)
$
113,000

 
$
788

 
$
112,212

 
$
113,000

 
$
1,182

 
$
111,818

3.25% convertible senior notes (due 2020) *
30,503

 

 
30,503

 
27,974

 

 
27,974

Total convertible senior notes, net of debt issuance costs
$
143,503

 
$
788

 
$
142,715

 
$
140,974

 
$
1,182

 
$
139,792

* The amount presented for the 3.25% 2020 convertible senior notes within the table represents the fair value as of June 30, 2019 and December 31, 2018 (see Note 16). The principal amount of these notes totals $29.5 million as of June 30, 2019 and December 31, 2018.