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Convertible Senior Notes - Net Carrying Amount (Details) - Senior Notes - USD ($) | Sep. 30, 2021 | Dec. 31, 2020 | Aug. 31, 2020 | Apr. 30, 2019 | Mar. 31, 2019 | Apr. 30, 2018
--- | --- | --- | --- | --- | --- | ---
Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount | $ 1,676,749,000 | $ 1,506,922,000 |  |  |  |
2026 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal | 1,000,000,000 | 1,000,000,000 | $ 1,000,000,000 |  |  |
Unamortized debt discount | 0 | (226,732,000) |  |  |  |
Unamortized issuance costs | (12,973,000) | (11,338,000) |  |  |  |
2026 Notes | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount | 987,027,000 | 761,930,000 |  |  |  |
2025 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal | 699,989,000 | 800,000,000 |  | $ 100,000,000 | $ 700,000,000 |
Unamortized debt discount | 0 | (149,138,000) |  |  |  |
Unamortized issuance costs | (10,267,000) | (10,248,000) |  |  |  |
2025 Notes | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount | 689,722,000 | 640,614,000 |  |  |  |
2023 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal |  | 115,576,000 |  |  |  | $ 345,000,000
Unamortized debt discount |  | (9,953,000) |  |  |  |
Unamortized issuance costs |  | (1,245,000) |  |  |  |
2023 Notes | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Net carrying amount | $ 0 | $ 104,378,000 |  |  |  |

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