Stock-Based Compensation (Details 1) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares
Employee stock option
Stock-based Compensation
Weighted-average grant-date fair value (in dollars per share) \| $ / shares	$ 18.95	$ 18.05
Total unrecognized compensation expense \| $	$ 69.9	$ 69.9
Weighted average period over which unrecognized compensation is expected to be recognized		3 years
Restricted stock units (RSUs)
Stock-based Compensation
Weighted-average grant-date fair value (in dollars per share) \| $ / shares	$ 33.03
Total unrecognized compensation expense \| $	$ 1.8	$ 1.8
Weighted average period over which unrecognized compensation is expected to be recognized		4 years

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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