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Convertible Senior Notes - Net Carrying Amount (Details) - Convertible Senior Notes - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Aug. 31, 2020	Mar. 31, 2019	Apr. 30, 2018
0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Principal amount	$ 1,000,000,000	$ 1,000,000,000	$ 1,000,000,000
Unamortized debt discount	0	(226,732,000)
Unamortized issuance costs	(12,309,000)	(11,338,000)
0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Principal amount	699,982,000	800,000,000		$ 700,000,000
Unamortized debt discount	0	(149,138,000)
Unamortized issuance costs	(9,518,000)	(10,248,000)
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Principal amount		115,576,000			$ 345,000,000
Unamortized debt discount		(9,953,000)
Unamortized issuance costs		(1,245,000)
Carrying Amount | Fair Value, Nonrecurring
Debt Instrument [Line Items]
Net carrying amount (liability)	1,678,155,000	1,506,922,000
Carrying Amount | Fair Value, Nonrecurring | 0% Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Net carrying amount (liability)	987,691,000	761,930,000
Carrying Amount | Fair Value, Nonrecurring | 0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Net carrying amount (liability)	690,464,000	640,614,000
Carrying Amount | Fair Value, Nonrecurring | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Net carrying amount (liability)	$ 0	$ 104,378,000

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