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Convertible Senior Notes - Notes Payable (Details) - USD ($)	Jun. 30, 2018	May 22, 2018	Dec. 31, 2017	Aug. 31, 2014
Notes Payable, Current and Noncurrent [Abstract]
Carrying value of equity component of 2023 Notes	$ 0		$ 18,859,000
Convertible Notes | 2019 Convertible Senior Notes
Notes Payable, Current and Noncurrent [Abstract]
Principal amount of 2019 Notes outstanding	223,215,000		245,000,000	$ 245,000,000.0
Unamortized discount (including unamortized debt issuance cost)	(12,845,000)		(20,471,000)
Total current portion of notes payable	210,370,000		224,529,000
Convertible Notes | 2023 Convertible Senior Notes
Notes Payable, Current and Noncurrent [Abstract]
Principal amount of 2019 Notes outstanding	750,000,000	$ 750,000,000	0
Unamortized discount (including unamortized debt issuance cost)	(154,088,000)		0
Total long-term portion of notes payable	595,912,000		0
Carrying value of equity component of 2023 Notes	143,986,000		0
Fair value of convertible senior notes outstanding (Level 2)	$ 1,389,800,000		$ 446,360,000,000

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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Face (par) amount of debt instrument at time of issuance.

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