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Convertible Senior Notes, Net (Details)					12 Months Ended
	Nov. 09, 2017 USD ($)	Aug. 21, 2017 USD ($)	Aug. 18, 2014 USD ($)	Mar. 17, 2014 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 29, 2017 $ / shares
Debt Instrument [Line Items]
Proceeds from issuance of convertible senior notes					$ 343,275,000	$ 0	$ 0
Convertible senior notes, net					584,897,000	249,994,000
Share price (in dollars per share) | $ / shares								$ 18.45
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				$ 143,750,000
Coupon rate				5.50%
Proceeds from issuance of convertible senior notes				$ 139,037,000
Convertible senior notes, net					142,498,000
Unamortized discount					1,252,000
Convertible Debt [Member] | August 2019 Notes [Member]
Debt Instrument [Line Items]
Principal amount			$ 111,000,000
Coupon rate			5.50%
Proceeds from issuance of convertible senior notes			$ 109,615,000
Convertible senior notes, net					109,436,000
Unamortized discount					1,564,000
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		$ 224,825,000
Convertible senior notes, net					220,897,000
Unamortized discount					9,103,000
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	$ 112,686,000
Convertible senior notes, net					112,065,000
Unamortized discount					2,935,000
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			50.23
Remaining period of amortization (years)			4 years 7 months 24 days
Equity component of senior notes					11,002,000
Convertible Debt [Member] | 2019 and 2022 Notes [Member]
Debt Instrument [Line Items]
Equity component of senior notes					22,447,000
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				57.49
Remaining period of amortization (years)				1 year 2 months 13 days
Equity component of senior notes					11,445,000
Interest expense on debt					18,726,000	14,011,000	14,011,000
Additional non-cash interest expense					$ 4,724,000	$ 3,557,000	$ 3,440,000

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