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Convertible Senior Notes - Long-term Debt Instruments (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2020 | Apr. 30, 2019 | Apr. 30, 2018 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |
Net proceeds |  |  |  | $ 0 | $ 984,096
2026 Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 1,000,000 |  |  |  |
Less initial purchasers’ discount | (15,000) |  |  |  |
Less other issuance costs | (904) |  |  |  |
Net proceeds | $ 984,096 |  |  |  |
2025 Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  | $ 800,000 |  |  |
Less initial purchasers’ discount |  | (18,998) |  |  |
Less other issuance costs |  | (822) |  |  |
Net proceeds |  | $ 780,180 |  |  |
2023 Notes | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount |  |  | $ 345,000 |  |
Less initial purchasers’ discount |  |  | (8,625) |  |
Less other issuance costs |  |  | (757) |  |
Net proceeds |  |  | $ 335,618 |  |

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