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Convertible Senior Notes, Net (Details)					3 Months Ended		6 Months Ended
	Nov. 09, 2017 USD ($)	Aug. 21, 2017 USD ($)	Aug. 18, 2014 USD ($)	Mar. 17, 2014 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 27, 2018 $ / shares	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Convertible senior notes, net					$ 587,063,000		$ 587,063,000			$ 584,897,000
Share price (in dollars per share) | $ / shares									$ 18.58
Convertible Debt [Member]
Debt Instrument [Line Items]
Principal amount			$ 599,750,000
Conversion rate basis, principal amount							1,000,000
Convertible Debt [Member] | March 2019 Notes [Member]
Debt Instrument [Line Items]
Principal amount				$ 143,800,000.0
Coupon rate				5.50%
Proceeds from issuance of convertible senior notes				$ 139,000,000
Convertible senior notes, net					143,000,000		143,000,000
Unamortized discount					800,000		800,000
Convertible Debt [Member] | August 2019 Notes [Member]
Debt Instrument [Line Items]
Principal amount			$ 111,000,000.0
Coupon rate			5.50%
Proceeds from issuance of convertible senior notes			$ 109,600,000
Convertible senior notes, net					110,000,000		110,000,000
Unamortized discount					1,000,000		1,000,000
Convertible Debt [Member] | August 2022 Notes [Member]
Debt Instrument [Line Items]
Principal amount		$ 230,000,000
Coupon rate		4.75%
Proceeds from issuance of convertible senior notes		$ 224,800,000
Convertible senior notes, net					221,800,000		221,800,000
Unamortized discount					8,200,000		8,200,000
Convertible Debt [Member] | November 2022 Notes [Member]
Debt Instrument [Line Items]
Principal amount	$ 115,000,000
Coupon rate	4.75%
Proceeds from issuance of convertible senior notes	$ 112,700,000
Convertible senior notes, net					112,300,000		112,300,000
Unamortized discount					2,700,000		2,700,000
Convertible Debt [Member] | 2019 and 2022 Notes [Member]
Debt Instrument [Line Items]
Equity component of senior notes							22,400,000
Convertible Debt [Member] | 2019 Notes [Member]
Debt Instrument [Line Items]
Principal amount				$ 254,750,000
Coupon rate				5.50%
Effective rate				6.36%
Conversion rate				57.8613
Remaining period of amortization (years)				8 months 13 days
Equity component of senior notes							11,400,000
Interest expense on debt					7,600,000	$ 3,500,000	15,200,000	$ 7,000,000
Additional non-cash interest expense					$ 1,800,000	$ 900,000	3,700,000	$ 1,800,000
Convertible Debt [Member] | 2022 Notes [Member]
Debt Instrument [Line Items]
Principal amount			$ 345,000,000
Coupon rate			4.75%
Effective rate			5.61%
Conversion rate			50.2260
Remaining period of amortization (years)			4 years 1 month 24 days
Equity component of senior notes							$ 11,000,000

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