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Convertible Senior Notes, Net (Details)			2 Months Ended	3 Months Ended			12 Months Ended
	Mar. 15, 2019 USD ($)	Aug. 02, 2018 USD ($) shares	Sep. 30, 2018 USD ($) shares	Mar. 31, 2020 USD ($) $ / shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) offering	Dec. 31, 2014 USD ($) offering	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Cash payment for debt redemption				$ 0	$ 704,000
Conversions of convertible senior notes for common stock					$ 33,778,000
Convertible senior notes, net				$ 562,571,000					$ 561,573,000
Common Stock
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock (in shares) | shares					1,967,361
Conversions of convertible senior notes for common stock					$ 20,000
Share price (in dollars per share) | $ / shares				$ 7.42
Additional Paid In Capital
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock					33,758,000
Convertible Debt
Debt Instrument [Line Items]
Debt instrument, face amount				$ 575,000,000
Interest expense				7,200,000	7,600,000
Non-cash interest expense				1,500,000	$ 1,700,000
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 | 2019 Notes
Debt Instrument [Line Items]
Number of debt offerings issued | offering								2
Debt instrument, face amount								$ 254,800,000
Stated interest rate								5.50%
Proceeds from issuance of convertible senior notes								$ 248,600,000
Principal amount redeemed		$ 206,200,000	$ 47,900,000
Cash payment for debt redemption	$ 700,000	$ 39,300,000	$ 200,000
Convertible Debt | 2019 Notes | Common Stock
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock (in shares) | shares		10,020,328	2,775,509		1,967,361
Conversions of convertible senior notes for common stock					$ 33,800,000
Convertible Debt | 2019 Notes | Additional Paid In Capital
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock		$ 166,000,000.0	$ 13,900,000
Convertible Debt | 2022 Notes
Debt Instrument [Line Items]
Number of debt offerings issued | offering							2
Debt instrument, face amount							$ 345,000,000
Stated interest rate							4.75%
Proceeds from issuance of convertible senior notes							$ 337,500,000
Convertible senior notes, net				338,400,000
Unamortized discount				6,600,000
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						$ 230,000,000.0
Stated interest rate						5.375%
Proceeds from issuance of convertible senior notes						$ 223,700,000
Convertible senior notes, net				224,200,000
Unamortized discount				5,800,000
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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