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Convertible Senior Notes, Net (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) offering
Debt Instrument [Line Items]
Unamortized discount	$ 4,780,000
Common Stock
Debt Instrument [Line Items]
Share price (in dollars per share) | $ / shares	$ 13.97
Convertible Debt
Debt Instrument [Line Items]
Debt instrument, face amount	$ 575,000,000
Interest expense	7,200,000
Non-cash interest expense	1,500,000
Convertible Debt | 2019 and 2022 Notes | Additional Paid-In-Capital
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock	15,400,000
Convertible Debt | 2022 Notes
Debt Instrument [Line Items]
Number of debt offerings issued | offering			2
Debt instrument, face amount	$ 345,000,000		$ 345,000,000.0
Stated interest rate	4.75%		4.75%
Proceeds from issuance of Notes			$ 337,500,000
Convertible senior notes, net	$ 341,000,000.0
Unamortized discount	4,000,000.0
Convertible Debt | 2022 Notes | Additional Paid-In-Capital
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock	11,000,000.0
Convertible Debt | 2023 Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 230,000,000	$ 230,000,000.0
Stated interest rate	5.38%	5.375%
Proceeds from issuance of Notes		$ 223,700,000
Convertible senior notes, net	$ 225,700,000
Unamortized discount	4,300,000
Convertible Debt | 2023 Notes | Additional Paid-In-Capital
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock	$ 4,400,000

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