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Convertible Senior Notes (Tables)
9 Months Ended
Sep. 30, 2015
Convertible Notes Payable [Abstract]  
Schedule of Convertible Notes
The Notes consisted of the following (in thousands):
 
September 30, 2015
 
December 31, 2014
Liability:
 
 
 
Principal
$
575,000

 
$
575,000

Less: debt discount, net of amortization
(108,169
)
 
(131,236
)
Net carrying amount
$
466,831

 
$
443,764

Interest Expense Recognized Related to the Notes
The following table sets forth total interest expense recognized related to the Notes (in thousands):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Amortization of debt issuance cost
$
420

 
$
393

 
$
1,240

 
$
1,158

Amortization of debt discount
7,419

 
6,932

 
21,884

 
20,450

Total
$
7,839

 
$
7,325

 
$
23,124

 
$
21,608

Effective interest rate of the liability component
6.5%