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Convertible Senior Notes (Tables)
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Summary of Notes Net of Discount and Deferred Financing Costs

The 2024 Notes, net of discounts and deferred financing costs, consisted of the following:

 

(in thousands)

 

September 30,

2019

 

 

December 31,

2018

 

Principal

 

$

517,500

 

 

$

517,500

 

Deferred financing costs

 

 

(7,290

)

 

 

(8,326

)

Debt discount, net

 

 

(106,621

)

 

 

(120,678

)

Net carrying amount

 

$

403,589

 

 

$

388,496