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Debt (Tables)
 9 Months Ended
Sep. 30, 2014
Debt Disclosure [Abstract]  
Components of convertible senior notes
The components of the Notes are summarized as follows (in thousands):
 
September 30,
2014
 
December 31,
2013
Equity component, net of equity issue costs
$
60,222

 
$
60,222

Liability component:
 
 
 
Principal
287,500

 
287,500

Less: unamortized debt discount
(49,480
)
 
(57,795
)
Net carrying amount
$
238,020

 
$
229,705
Interest expense related to convertible senior notes
The following table sets forth total interest expense recognized related to the Notes for the three and nine months ended September 30, 2014 (in thousands except percentages):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Contractual interest expense
$
718

 
$
399

 
$
2,148

 
$
399

Amortization of debt issuance costs
319

 
213

 
958

 
213

Amortization of debt discount
2,792

 
1,483

 
8,315

 
1,483

Total
$
3,829

 
$
2,095

 
$
11,421

 
$
2,095

 
 
 
 
 
 
 
 
Effective interest rate
6.5
%
 
6.6
%
 
6.5
%
 
6.6
%