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Convertible Senior Notes - Equity and Liability Components of Financing Arrangements (Details) - Convertible Notes - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Notes Payable, Current and Noncurrent |  |
Principal amount of 2023 Notes outstanding | $ 495,280 | $ 750,000
Unamortized discount (including unamortized debt issuance cost) | (52,987) | (111,041)
Total long-term portion of notes payable | 442,293 | 638,959
Carrying value of equity component of 2023 Notes | 48,397 | 101,422
Fair value of convertible senior notes outstanding (Level 2) | $ 466,053 | $ 647,280

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