Subsequent Events (Details) (USD $)	3 Months Ended	1 Months Ended
Mar. 31, 2015	May 12, 2015
Options
Subsequent Events
Stock options granted (in shares)	430,189
Stock options granted, weighted average exercise price (in dollars per share)	$ 17.66
Restricted stock units
Subsequent Events
Restricted stock units granted (in shares)	237,901
Weighted average grant date fair value, restricted stock units granted (in dollars per share)	$ 17.73
Subsequent Event \| Options
Subsequent Events
Stock options granted (in shares)		1,074,085
Stock options granted, weighted average exercise price (in dollars per share)		$ 15.69
Vesting period		4 years
Subsequent Event \| Restricted stock units
Subsequent Events
Restricted stock units granted (in shares)		438,570
Weighted average grant date fair value, restricted stock units granted (in dollars per share)		$ 15.68
Vesting period		4 years

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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 (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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 (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

+ Details

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