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Convertible Senior Notes (Tables)
12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]  
Schedule of Convertible Senior Notes
The Notes consist of the following components as of December 31, 2014 (in thousands):

 
December 31, 2014
Liability component:
 
Principal
$
690,000

Less: debt discount, net of amortization
(85,149
)
Net carrying amount
$
604,851

 
 
Equity component:
$
101,276

Schedule of Interest Expense
The following table sets forth total interest expense included in the statement of operations related to the Notes for the year ended December 31, 2014 (in thousands):

 
For the Year Ended December 31, 2014
Amortization of debt discount
$
16,127

Amortization of debt issuance costs
1,531

Capitalization of interest expense
(2,195
)
Total interest expense
$
15,463