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Indebtedness - Carrying Value of Senior Convertible Notes (Details) - USD ($)	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2016
Debt Instrument [Line Items]
Total Senior Convertible Notes	$ 1,380,861,000		$ 623,298,000
Less: Current portion	(634,142,000)
Long-term Senior Convertible Notes	746,719,000		623,298,000
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member]
Debt Instrument [Line Items]
Principal amount	650,000,000		650,000,000	$ 650,000,000.0
Unamortized debt discount	(13,344,000)		(22,501,000)
Unamortized debt issuance costs	(2,514,000)		(4,201,000)
Total Senior Convertible Notes	634,142,000		$ 623,298,000
1.00% Senior Convertible Notes [Member] \| Convertible Notes due 2023 [Member]
Debt Instrument [Line Items]
Principal amount	450,000,000
Unamortized debt discount	(55,761,000)
Unamortized debt issuance costs	(13,512,000)
Total Senior Convertible Notes	380,727,000
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member]
Debt Instrument [Line Items]
Principal amount	450,000,000	$ 450,000,000.0
Unamortized debt discount	(73,549,000)
Unamortized debt issuance costs	(10,459,000)
Total Senior Convertible Notes	$ 365,992,000