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Indebtedness - Carrying Value of Senior Convertible Notes (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Mar. 31, 2016
Debt Instrument [Line Items]
Total Senior Convertible Notes	$ 884,984,000	$ 1,411,529,000
Less: Current portion		(645,303,000)
Long-term Senior Convertible Notes	884,984,000	766,226,000
2.25% Senior Convertible Notes [Member] \| Convertible Notes due 2021 [Member]
Debt Instrument [Line Items]
Principal amount	650,000,000.0	650,000,000		$ 650,000,000.0
Unamortized debt discount		(3,945,000)
Unamortized debt issuance costs		(752,000)
Total Senior Convertible Notes	645,300,000	645,303,000
1.00% Senior Convertible Notes [Member] \| Convertible Notes due 2023 [Member]
Debt Instrument [Line Items]
Principal amount	450,000,000	450,000,000
Unamortized debt discount		(46,837,000)
Unamortized debt issuance costs	(6,543,000)	(11,049,000)
Total Senior Convertible Notes	443,457,000	392,114,000
0.375% Senior Convertible Notes [Member] \| Convertible Notes due 2025 [Member]
Debt Instrument [Line Items]
Principal amount	450,000,000	450,000,000	$ 450,000,000.0
Unamortized debt discount		(66,346,000)
Unamortized debt issuance costs	(8,473,000)	(9,542,000)
Total Senior Convertible Notes	$ 441,527,000	$ 374,112,000