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Convertible Senior Notes (Tables)
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Convertible Debt

September 30, 

December 31, 

    

2019

    

2018

(In thousands)

Principal amount

$

210,000

$

210,000

Unamortized discount

 

(49,907)

 

(56,156)

Unamortized issuance costs attributable to principal amount

 

(4,322)

 

(4,863)

Total Convertible Notes, net

$

155,771

$

148,981