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Convertible Senior Notes (Tables)
3 Months Ended
Mar. 31, 2015
Debt Disclosure [Abstract]  
Schedule of Debt Interest Expense
The following table sets forth total interest expense recognized related to the 2017 Notes:
 
Three Months Ended March 31,
 
 
2015
 
2014
 
 
(in thousands)
 
Contractual interest expense
$
945

 
$
945

 
Amortization of debt issuance costs
360

 
320

 
Amortization of debt discount
2,753

 
2,595

 
Total
$
4,058

 
$
3,860

 
Effective interest rate of the liability component
6.02
%
 
6.02
%
 
The following table sets forth total interest expense recognized related to the 2022 Notes:
 
Three Months Ended March 31,
 
 
2015
 
2014
 
 
(in thousands)
 
Contractual interest expense
$
2,152

 
$

 
Amortization of debt issuance costs
202

 

 
Amortization of debt discount
2,201

 

 
Total
$
4,555

 
$

 
Effective interest rate of the liability component
6.5
%
 

 
Schedule of Debt Liability Component
The 2017 Notes consist of the following:
Liability component
 
March 31,
2015
 
December 31,
2014
 
 
(in thousands)
Principal
 
$
275,000

 
$
275,000

Less: Debt discount, net(1)
 
(25,571
)
 
(28,324
)
Net carrying amount
 
$
249,429

 
$
246,676

(1) Included in the consolidated balance sheets within convertible senior notes (due 2017) and amortized to interest expense over the remaining life of the 2017 Notes using the effective interest rate method.