Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2018

Convertible Senior Notes

Summary of liability component of 2023 Notes

The liability component of the 2023 Notes consisted of the following, in thousands of dollars:

	September 30,
	2018
	(unaudited)
Principal amount of the 2023 Notes	$	402,500
Debt discount		(76,434)
Deferred financing costs		(8,452)
Accretion of debt discount and deferred financing costs		8,052
September 30, 2018 carrying value	$	325,666