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Convertible Senior Notes - Net Carrying Amount (Details) - Senior Notes - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Apr. 30, 2018
0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Principal	$ 800,000,000	$ 800,000,000	$ 100,000,000	$ 700,000,000
Unamortized debt discount	(175,857,000)	(184,698,000)
Unamortized issuance costs	(12,084,000)	(12,691,000)
Debt discount for conversion option	212,000,000	212,000,000
Issuance costs	(5,253,000)	(5,253,000)
Net carrying amount (equity)	206,747,000	206,747,000
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Principal	345,000,000	345,000,000			$ 345,000,000
Unamortized debt discount	(39,155,000)	(42,280,000)
Unamortized issuance costs	(4,655,000)	(5,028,000)
Debt discount for conversion option	64,193,000	64,193,000
Issuance costs	(1,749,000)	(1,749,000)
Net carrying amount (equity)	62,444,000	62,444,000
Carrying Amount | Fair Value, Measurements, Nonrecurring
Debt Instrument [Line Items]
Net carrying amount (liability)	913,249,000	900,303,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.125% Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Net carrying amount (liability)	612,059,000	602,611,000
Carrying Amount | Fair Value, Measurements, Nonrecurring | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Net carrying amount (liability)	$ 301,190,000	$ 297,692,000

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