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Convertible Senior Notes, Net (Details)			3 Months Ended					7 Months Ended	9 Months Ended		12 Months Ended
	Mar. 15, 2019 USD ($)	Aug. 02, 2018 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) shares	Mar. 31, 2014 USD ($)	Mar. 15, 2019 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Dec. 31, 2017 USD ($) offering	Dec. 31, 2014 USD ($) offering	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Cash payment for debt redemption									$ 0	$ 704,000
Conversions of convertible senior notes for common stock						$ 33,778,000
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			$ 9.01						$ 9.01
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						$ 575,000,000
Interest expense			7,200,000		$ 7,200,000				21,600,000	21,900,000
Non-cash interest expense			1,500,000		$ 1,500,000				4,500,000	$ 4,600,000
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				1,967,361		2,775,509
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						$ 345,000,000		$ 345,000,000.0
Stated interest rate			4.75%						4.75%		4.75%
Proceeds from issuance of convertible senior notes											$ 337,500,000
Convertible senior notes, net			$ 339,700,000						$ 339,700,000
Unamortized discount			5,300,000						5,300,000
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						$ 230,000,000				$ 230,000,000.0
Stated interest rate			5.38%						5.38%				5.375%
Proceeds from issuance of convertible senior notes				$ 223,700,000
Convertible senior notes, net			$ 224,900,000						$ 224,900,000
Unamortized discount			$ 5,100,000						5,100,000
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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