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Convertible Senior Notes (Tables)
12 Months Ended
Dec. 31, 2015
Convertible Senior Notes
Convertible senior notes consist of the following (in thousands):
 
   
December 31,
   
2014
 
2015
4.25% Convertible senior notes (due 2018)
 
$
100,000
   
$
100,000
 
4.875% Convertible senior notes (due 2020)
   
115,000
     
115,000
 
   
$
215,000
   
$
215,000
 
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,
   
2013
 
2014
 
2015
Contractual interest expense on the coupon
 
$
3,356
   
$
1,463
   
$
 
Amortization of debt discount and debt issuance costs recognized as interest expense
   
2,030
     
1,140
     
 
   
$
5,386
   
$
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):
 
   
December 31,
   
2014
 
2015
Principal amount of notes
 
$
100,000
   
$
100,000
 
Net carrying amount of the 2018 convertible notes
 
$
100,000
   
$
100,000
 
 
 
   
Years Ended December 31,
   
2013
 
2014
 
2015
Contractual interest expense
 
$
1,771
   
$
4,250
   
$
4,250
 
Amortization of debt issuance costs recognized as interest expense
   
421
     
835
     
836
 
   
$
2,192
   
$
5,085
   
$
5,086
 
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):
 
   
December 31,
   
2014
 
2015
Principal amount of notes
 
$
115,000
   
$
115,000
 
Net carrying amount of the 2020 convertible notes
 
$
115,000
   
$
115,000
 
 
 
   
Years Ended December 31,
   
2013
 
2014
 
2015
Contractual interest expense
 
$
   
$
3,135
   
$
5,606
 
Amortization of debt issuance costs recognized as interest expense
   
     
473
     
811
 
   
$
   
$
3,608
   
$
6,417