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CONVERTIBLE SENIOR NOTES (Tables)
9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Debt Net of Discounts and Deferred Financing Costs

Debt, net of discounts and deferred financing costs at September 30, 2018 and December 31, 2017, consisted of the following (in thousands):

 

 

 

September 30,

2018

 

 

December 31,

2017

 

Principal

 

$

517,500

 

 

$

517,500

 

Deferred financing costs

 

 

(8,663

)

 

 

(9,652

)

Debt discount, net

 

 

(125,190

)

 

 

(138,230

)

Net carrying amount

 

$

383,647

 

 

$

369,618