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CONVERTIBLE SENIOR NOTES (Tables)
12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Convertible Senior Notes Net of Discounts and Deferred Financing Costs

Convertible senior notes, net of discounts and deferred financing costs consisted of the following:

 

 

December 31,

 

(in thousands)

2018

 

 

2017

 

Principal

$

517,500

 

 

$

517,500

 

Deferred financing costs

 

(8,326

)

 

 

(9,652

)

Debt discount, net

 

(120,678

)

 

 

(138,230

)

Net carrying amount

$

388,496

 

 

$

369,618