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Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2018
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, 2018 |  | December 31, 2017
Principal amount of 2019 Notes outstanding | $ | 223,215 |  |  | $ | 245,000 |
Unamortized discount (including unamortized debt issuance cost) | (12,845 | ) |  | (20,471 | )
Total current portion of notes payable | $ | 210,370 |  |  | $ | 224,529 |
Principal amount of 2023 Notes outstanding | $ | 750,000 |  |  | $ | — |
Unamortized discount (including unamortized debt issuance cost) | (154,088 | ) |  | — |
Total long-term portion of notes payable | $ | 595,912 |  |  | $ | — |
Carrying value of equity component of 2023 Notes | $ | 143,986 |  |  | $ | — |
Fair value of convertible senior notes outstanding (Level 2) | $ | 1,389,800 |  |  | $ | 446,360 |

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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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