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Convertible Senior Notes - Net Carrying Amount (Details) - Senior Notes - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Aug. 31, 2020	Apr. 30, 2019	Mar. 31, 2019
2026 Notes
Debt Instrument [Line Items]
Principal	$ 1,000,000	$ 1,000,000	$ 1,000,000
Unamortized issuance costs	(11,659)	(12,309)
2026 Notes | Carrying Amount | Fair Value, Measurements, Nonrecurring
Debt Instrument [Line Items]
Net carrying amount	988,341	987,691
2025 Notes
Debt Instrument [Line Items]
Principal	699,979	699,982		$ 100,000	$ 700,000
Unamortized issuance costs	(8,786)	(9,518)
2025 Notes | Carrying Amount | Fair Value, Measurements, Nonrecurring
Debt Instrument [Line Items]
Net carrying amount	$ 691,193	$ 690,464

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- Definition

Face (par) amount of debt instrument at time of issuance.

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