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Convertible Debt, Net (Tables)
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Outstanding Convertible Debt and Related Debt Issuance Costs
The Company had outstanding convertible debt and related debt issuance costs on its consolidated balance sheet as follows:
 
As of
(in thousands)
September 30, 2019
 
December 31, 2018
1.25% Convertible Senior Notes, due September 2021
$
119,988

 
$
344,992

1.375% Convertible Senior Notes, due November 2024
402,500

 
402,500

0.375% Convertible Senior Notes, due September 2026
$
800,000

 
$

Unamortized debt discount
(315,017
)
 
(143,616
)
Debt issuance costs
(21,700
)
 
(11,898
)
Total convertible debt, net
$
985,771

 
$
591,978


Summary of Carrying Amount and Estimated Fair Value of Convertible Debt
The carrying amount and the estimated fair value of the Company's convertible debt, which is based on the Level 2 quoted market prices as of September 30, 2019 and December 31, 2018 were as follows:
 
As of
 
September 30, 2019
 
December 31, 2018
(in thousands)
Carrying Value
 
Estimated Fair Value
 
Carrying Value
 
Estimated Fair Value
1.25% Convertible Senior Notes, due September 2021
$
108,666

 
$
335,968

 
$
301,006

 
$
483,851

1.375% Convertible Senior Notes, due November 2024
302,796

 
512,797

 
290,972

 
426,026

0.375% Convertible Senior Notes, due September 1, 2026
574,309

 
812,928

 

 

  Total
$
985,771

 
$
1,661,693

 
$
591,978

 
$
909,877