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Convertible Senior Notes - Net Carrying Amount (Details) - Shares related to convertible senior notes - USD ($)	Dec. 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Apr. 30, 2018
0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Principal amount	$ 800,000,000		$ 700,000,000
Unamortized debt discount	(184,698,000)
Unamortized issuance costs	(12,691,000)
Debt discount for conversion option	212,000,000
Issuance costs	(5,253,000)
Net carrying amount	206,747,000	$ 212,000,000.0
0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Principal amount	345,000,000			$ 345,000,000	$ 345,000,000
Unamortized debt discount	(42,280,000)			(54,817,000)
Unamortized issuance costs	(5,028,000)			(6,515,000)
Debt discount for conversion option	64,193,000			64,193,000
Issuance costs	(1,749,000)			(1,749,000)
Net carrying amount	62,444,000			62,444,000	$ 64,200,000
Carrying Amount | Fair Value, Nonrecurring
Debt Instrument [Line Items]
Net carrying amount (liability)	900,303,000			283,668,000
Carrying Amount | Fair Value, Nonrecurring | 0.125 Percent Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Net carrying amount (liability)	602,611,000			0
Carrying Amount | Fair Value, Nonrecurring | 0.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Net carrying amount (liability)	$ 297,692,000			$ 283,668,000

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