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Convertible Senior Notes, Net (Details)			3 Months Ended				6 Months Ended		7 Months Ended	12 Months Ended
	Mar. 15, 2019 USD ($)	Aug. 02, 2018 USD ($) shares	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Mar. 15, 2019 USD ($) shares	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			$ 563,583,000				$ 563,583,000					$ 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			$ 9.81				$ 9.81
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			14,400,000	14,800,000
Non-cash interest expense			1,500,000	$ 1,400,000			3,000,000.0	$ 3,100,000
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
Stated interest rate										4.75%
Proceeds from issuance of convertible senior notes										$ 337,500,000
Convertible senior notes, net			339,000,000.0				339,000,000.0
Unamortized discount			6,000,000.0				6,000,000.0
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						$ 230,000,000.0
Stated interest rate						5.375%
Proceeds from issuance of convertible senior notes						$ 223,700,000
Convertible senior notes, net			224,500,000				224,500,000
Unamortized discount			$ 5,500,000				5,500,000
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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