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Net (Loss) Income Per Share (Narrative) (Details) - Convertible Senior Notes [Member] - USD ($)	Sep. 30, 2018	Aug. 31, 2018	Aug. 24, 2018	Dec. 31, 2017	Jun. 30, 2014
2019 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Convertible senior notes, issued	$ 66,138,000			$ 329,972,000	$ 330,000,000
Convertible senior notes, interest rate					2.25%
2028 Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Convertible senior notes, issued	$ 880,000,000	$ 880,000,000
Convertible senior notes, interest rate		2.00%	2.00%

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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+ References

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