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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 ($) shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) offering	Dec. 31, 2017 USD ($)	Dec. 31, 2014 USD ($) offering	Oct. 05, 2018 USD ($)
Debt Instrument [Line Items]
Cash payment for debt redemption				$ 704,000		$ 0
Conversions of convertible senior notes for common stock				33,778,000
Convertible senior notes, net				558,664,000	$ 592,000,000		$ 592,000,000
2019 Notes [Member]
Debt Instrument [Line Items]
Loss on early extinguishment of debt				0			$ 2,600,000
Convertible Debt [Member]
Debt Instrument [Line Items]
Principal Amount				575,000,000
Interest expense				7,600,000		7,600,000
Non-cash interest expense				1,700,000		$ 1,800,000
Convertible Debt [Member] | 2019 Notes [Member]
Debt Instrument [Line Items]
Number of debt offerings issued | offering									2
Principal Amount									$ 254,800,000.0
Coupon 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 [Member] | 2022 Notes [Member]
Debt Instrument [Line Items]
Number of debt offerings issued | offering							2
Principal Amount								$ 345,000,000
Coupon Rate								4.75%
Proceeds from issuance of convertible senior notes								$ 337,500,000
Convertible senior notes, net				335,900,000
Unamortized discount				9,100,000
Convertible Debt [Member] | 2023 Notes [Member]
Debt Instrument [Line Items]
Principal Amount										$ 230,000,000
Coupon Rate										5.375%
Proceeds from issuance of convertible senior notes					$ 223,700,000
Convertible senior notes, net				222,800,000
Unamortized discount				$ 7,200,000
Common Stock [Member]
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
Common Stock [Member] | Convertible Debt [Member] | 2019 Notes [Member]
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
Additional Paid In Capital [Member]
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock				33,758,000
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2019 and 2022 Notes [Member]
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock				15,400,000
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2019 Notes [Member]
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock		$ 166,000,000	$ 13,900,000
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2022 Notes [Member]
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock				11,000,000
Additional Paid In Capital [Member] | Convertible Debt [Member] | 2023 Notes [Member]
Debt Instrument [Line Items]
Conversions of convertible senior notes for common stock				$ 4,400,000

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