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Convertible Senior Notes (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Schedule of Carrying Values and Coupon Rates on Financing Arrangements

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

			June 30, 2019						December 31, 2018
Principal amount of 2019 Notes outstanding			$	27,323					$	27,326
Unamortized discount (including unamortized debt issuance cost)			(236)						(893)
Total current portion of notes payable			$	27,087					$	26,433
Principal amount of 2023 Notes outstanding			$	750,000					$	750,000
Unamortized discount (including unamortized debt issuance cost)			(125,791)						(140,136)
Total long-term portion of notes payable			$	624,209					$	609,864
Fair value of both 2019 Notes and 2023 Notes outstanding (Level 2)			$	689,172					$	713,533

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- Definition

Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.

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