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Convertible Senior Notes, Net (Details)					3 Months Ended
	Nov. 09, 2017 USD ($)	Aug. 21, 2017 USD ($)	Aug. 18, 2014 USD ($)	Mar. 17, 2014 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 29, 2018 $ / shares	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Convertible senior notes, net					$ 585,972,000			$ 584,897,000
Share price (in dollars per share) | $ / shares							$ 17.98
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					142,700,000
Unamortized discount					1,100,000
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					109,700,000
Unamortized discount					1,300,000
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					221,300,000
Unamortized discount					8,700,000
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					112,200,000
Unamortized discount					2,800,000
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				57.6745
Remaining period of amortization (years)				11 months 13 days
Equity component of senior notes					11,400,000
Interest expense on debt					7,600,000	$ 3,500,000
Additional non-cash interest expense					1,800,000	$ 900,000
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 4 months 24 days
Equity component of senior notes					$ 11,000,000

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