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Convertible Senior Notes, Net - Additional Information (Details)			3 Months Ended								5 Months Ended	12 Months Ended
	Mar. 15, 2019 USD ($)	Aug. 02, 2018 USD ($) shares	Dec. 31, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) offering	Dec. 31, 2014 USD ($) offering
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes												$ 0	$ 226,550,000	$ 343,275,000
Cash payment for debt redemption												704,000	40,461,000	0
Exchange of Notes for common stock												33,778,000	180,016,000
Loss on early extinguishment of debt			$ 0	$ 0	$ 0	$ 0	$ 0	$ (2,573,000)	$ 0	$ 0		0	2,573,000	1,947,000
Convertible senior notes, net			561,573,000				592,000,000				$ 592,000,000	561,573,000	592,000,000
Convertible Debt
Debt Instrument [Line Items]
Principal Amount			575,000,000									575,000,000
Interest expense on debt												29,100,000	28,200,000	18,700,000
Additional non-cash interest expense												6,000,000.0	7,100,000	4,700,000
Convertible Debt | 2019 Notes
Debt Instrument [Line Items]
Number of debt offerings issued | offering															2
Principal Amount															$ 254,800,000
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
Loss on early extinguishment of debt												0	2,600,000	$ 0
Convertible Debt | 2022 Notes
Debt Instrument [Line Items]
Number of debt offerings issued | offering														2
Principal Amount														$ 345,000,000
Proceeds from issuance of convertible senior notes														$ 337,500,000
Convertible senior notes, net			337,800,000									337,800,000
Unamortized discount			7,200,000									7,200,000
Convertible Debt | 2023 Notes
Debt Instrument [Line Items]
Principal Amount							230,000,000.0				$ 230,000,000.0		$ 230,000,000.0
Proceeds from issuance of convertible senior notes							$ 223,700,000
Convertible senior notes, net			223,800,000									223,800,000
Unamortized discount			$ 6,200,000									$ 6,200,000
Common Stock
Debt Instrument [Line Items]
Exchange of convertible senior notes for common stock (in shares) | shares												1,967,361	10,828,475
Exchange of Notes for common stock												$ 20,000	$ 108,000
Share price (in dollars per share) | $ / shares			$ 18.29				$ 16.66				$ 16.66	$ 18.29	$ 16.66
Common Stock | Convertible Debt | 2019 Notes
Debt Instrument [Line Items]
Exchange of convertible senior notes for common stock (in shares) | shares		10,020,328				1,967,361					2,775,509		10,828,475
Exchange of Notes for common stock						$ 33,800,000
Additional Paid-In-Capital
Debt Instrument [Line Items]
Exchange of Notes for common stock												$ 33,758,000	$ 179,908,000
Additional Paid-In-Capital | Convertible Debt | 2019 and 2022 Notes [Member]
Debt Instrument [Line Items]
Exchange of Notes for common stock												15,400,000
Additional Paid-In-Capital | Convertible Debt | 2019 Notes
Debt Instrument [Line Items]
Exchange of Notes for common stock		$ 166,000,000.0									$ 13,900,000
Additional Paid-In-Capital | Convertible Debt | 2022 Notes
Debt Instrument [Line Items]
Exchange of Notes for common stock												11,000,000.0
Additional Paid-In-Capital | Convertible Debt | 2023 Notes
Debt Instrument [Line Items]
Exchange of Notes for common stock												$ 4,400,000

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