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Convertible Senior Notes (Tables)
9 Months Ended
Sep. 30, 2017
Convertible Senior Notes
Convertible senior notes consist of the following (in thousands):
 
   
September 30, 2017
   
December 31, 2016
 
   
Principal
Amount
   
Debt
Issuance
Costs
   
Net
Amount
   
Principal
Amount
   
Debt
Issuance
Costs
   
Net
Amount
 
4.25% convertible senior notes (due 2018)
 
$
42,728
   
$
298
   
$
42,430
   
$
93,865
   
$
1,098
   
$
92,767
 
4.875% convertible senior notes (due 2020)
   
113,000
     
2,169
     
110,831
     
113,000
     
2,760
     
110,240
 
Total
 
$
155,728
   
$
2,467
   
$
153,261
   
$
206,865
   
$
3,858
   
$
203,007