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Fair Value Measurement - Debt (Details) - Senior Notes - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Carrying Amount | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | $ 1,676,749 | $ 1,506,922
Estimated Fair Value | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | 1,995,930 | 2,963,119
2026 notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unamortized issuance costs | (12,973) | (11,338)
Unamortized debt discount | 0 | (226,732)
2026 notes | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | 987,027 | 761,930
2026 notes | Estimated Fair Value | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | 984,880 | 1,129,370
2025 notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unamortized issuance costs | (10,267) | (10,248)
Unamortized debt discount | 0 | (149,138)
2025 notes | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | 689,722 | 640,614
2025 notes | Estimated Fair Value | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | 1,011,050 | 1,456,800
2023 notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unamortized issuance costs |  | (1,245)
Unamortized debt discount |  | (9,953)
2023 notes | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | 0 | 104,378
2023 notes | Estimated Fair Value | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible senior notes | $ 0 | $ 376,949

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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