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Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Convertible Debt
The Convertible Notes consist of the following (in thousands):
 
September 30, 2018
 
December 31, 2017
Liability component
 
 
 
     Principal
$
1,437,483

 
$
1,437,483

     Less: note discount and issuance costs
(21,513
)
 
(51,159
)
Net carrying amount
$
1,415,970

 
$
1,386,324

 
 
 
 
Equity component
 
 
 
Temporary equity
$
19,286

 
$
—

Additional paid-in capital
143,583

 
162,869

Total (including temporary equity)
$
162,869

 
$
162,869
Schedule of Interest Expense Recognized Related to Convertible Notes
The following table includes total interest expense recognized related to the Convertible Notes and the 2027 Notes (in thousands):
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2018

2017
 
2018
 
2017
Contractual interest expense
$
9,721

 
$
1,797

 
$
30,283

 
$
5,391

Amortization of debt issuance costs
1,199

 
1,045

 
3,578

 
3,117

Amortization of debt discount
8,836

 
8,536

 
26,312

 
25,418

 
$
19,756

 
$
11,378

 
$
60,173

 
$
33,926