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Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Carrying Values and Coupon Rates on Financing Arrangements | The following table summarizes information about the 2023 Notes (in thousands):
| September 30, 2020 |  | December 31, 2019
Principal amount of the 2023 Notes outstanding | $ | 515,560 |  |  | $ | 750,000 |
Unamortized discount (including unamortized debt issuance cost) | (60,587) |  |  | (111,041) |
Total long-term portion of notes payable | $ | 454,973 |  |  | $ | 638,959 |
Carrying value of equity component of the 2023 Notes | $ | 55,339 |  |  | $ | 101,422 |
Fair value of the 2023 Notes outstanding (Level 2) | $ | 464,958 |  |  | $ | 647,280 |

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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. + References No definition available. + Details
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