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Convertible Senior Notes Due 2023 (Tables)
 9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Summary of liability component of 2023 Notes
The liability component of the 2023 Notes consists of the following, in thousands of dollars:
 
September 30,
2019
 
December 31,
2018
 
(unaudited)
 
 
Principal amount of the 2023 Notes
$
402,500

 
$
402,500

Debt discount
(76,434
)
 
(76,434
)
Deferred financing costs
(8,452
)
 
(8,452
)
Accretion of debt discount and deferred financing costs
23,549

 
11,848

Total carrying value
$
341,163

 
$
329,462