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Consolidated Statements of Cash Flows (Parenthetical)	Dec. 31, 2017
1.125% Call Option
Fixed interest rate on derivative	1.125%
1.125% Conversion Option
Fixed interest rate on derivative	1.125%
1.625% Convertible Notes
Percentage of contractual interest rate	1.625%
Convertible Debt | 1.625% Convertible Notes
Percentage of contractual interest rate	1.625%

X

- 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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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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