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Convertible Senior Notes - Long-term Debt Instruments (Details) - Senior Notes - USD ($) $ in Thousands | 1 Months Ended
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Aug. 31, 2020 | Apr. 30, 2019
2026 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 |  |
Debt Instrument [Line Items] |  |
Principal amount |  | $ 800,000
Less initial purchasers’ discount |  | (18,998)
Less other issuance costs |  | (822)
Net proceeds |  | $ 780,180

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