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Fair Value Measurement - Debt (Details) - Shares related to convertible senior notes - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Carrying Amount | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	$ 900,303	$ 283,668
Estimated Fair Value | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	1,354,538	416,156
0.125 Percent Convertible Senior Notes Due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized debt discount	184,698
Unamortized issuance costs	12,691
0.125 Percent Convertible Senior Notes Due 2025 | Carrying Amount | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	602,611	0
0.125 Percent Convertible Senior Notes Due 2025 | Estimated Fair Value | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	831,000	0
0.25% Convertible Senior Notes Due 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized debt discount	42,280	54,817
Unamortized issuance costs	5,028	6,515
0.25% Convertible Senior Notes Due 2023 | Carrying Amount | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	297,692	283,668
0.25% Convertible Senior Notes Due 2023 | Estimated Fair Value | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior notes	$ 523,538	$ 416,156

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Amount, after accumulated amortization, of debt discount (premium).

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