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Convertible Senior Notes (Tables)
 12 Months Ended
Dec. 31, 2015
Debt Disclosure [Abstract]  
Convertible Debt
The Convertible Notes consist of the following (in thousands):
 
December 31, 2015

Liability component
 
     Principal
$
1,437,500

     Less: note discount
(112,508
)
Net carrying amount
1,324,992

Equity component *
$
162,869

* Recorded in the consolidated balance sheet within additional paid-in capital.
Schedule of Interest Expense Recognized Related to Convertible Notes
The following table includes total interest expense recognized related to the Convertible Notes (in thousands):
 
Year Ended December 31,
 
2015
 
2014
Contractual interest expense
$
7,188

 
$
4,792

Amortization of debt issuance costs
3,974

 
2,461

Amortization of debt discount
32,039

 
20,832

 
$
43,201

 
$
28,085