Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Carrying Values and Coupon Rates on Financing Arrangements

The following table summarizes information about the 2019 Notes and 2023 Notes (in thousands):

	September 30, 2019		December 31, 2018
Principal amount of 2019 Notes outstanding	$	—	$	27,326
Unamortized discount (including unamortized debt issuance cost)	—		(893)
Total current portion of notes payable	$	—	$	26,433
Principal amount of 2023 Notes outstanding	$	750,000	$	750,000
Unamortized discount (including unamortized debt issuance cost)	(118,467)		(140,136)
Total long-term portion of notes payable	$	631,533	$	609,864
Carrying value of equity component of 2023 Notes	$	108,205	$	127,997
Fair value of both 2019 Notes and 2023 Notes outstanding (Level 2)	$	625,088	$	713,533