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Convertible Senior Notes (Tables)
12 Months Ended
Dec. 31, 2016
Convertible Senior Notes
Convertible senior notes consist of the following (in thousands):

 
 
December 31, 2015
   
December 31, 2016
 
 
       
Debt
               
Debt
       
 
 
Principal
   
Issuance
   
Net
   
Principal
   
Issuance
   
Net
 
 
 
Amount
   
Costs
   
Amount
   
Amount
   
Costs
   
Amount
 
4.25% convertible senior notes (due 2018)
  $
100,000
    $
2,181
    $
97,819
    $
93,865
    $
1,098
    $
92,767
 
4.875% convertible senior notes (due 2020)
   
115,000
     
3,653
     
111,347
     
113,000
     
2,760
     
110,240
 
Total convertible senior notes, net of debt issuance costs
  $
215,000
    $
5,834
    $
209,166
    $
206,865
    $
3,858
    $
203,007
 
4.50% Convertible senior notes (due 2014)  
Components of Convertible Senior Notes
Key components of the 4.50% convertible senior notes due 2014 consist of the following (in thousands):

 
 
Years Ended December 31,
 
 
 
2014
   
2015
 
 
 
2016
 
Contractual interest expense on the coupon
  $
1,463
    $
   
$
 
Amortization of debt discount and debt issuance costs recognized as interest expense
   
1,140
     
     
 
 
  $
2,603
    $
   
$
 
4.25% Convertible Senior Notes (due 2018)  
Components of Convertible Senior Notes
Key components of the 4.25% convertible senior notes due 2018 consist of the following (in thousands):
 
 
 
Years Ended December 31,
 
 
 
2014
   
2015
   
2016
 
Contractual interest expense
  $
4,250
    $
4,250
    $
4,191
 
Amortization of debt issuance costs recognized as interest expense
   
835
     
836
     
1,172
 
 
  $
5,085
    $
5,086
    $
5,363
 
4.875% Convertible Senior Notes (due 2020)  
Components of Convertible Senior Notes
Key components of the 4.875% convertible senior notes due 2020 consist of the following (in thousands):
 
 
 
Years Ended December 31,
 
 
 
2014
   
2015
   
2016
 
Contractual interest expense
  $
3,135
    $
5,606
    $
5,508
 
Amortization of debt issuance costs recognized as interest expense
   
473
     
811
     
804
 
 
  $
3,608
    $
6,417
    $
6,312