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

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- Definition

Percentage of vesting of share-based compensation awards.

+ References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

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- Definition

Represents the vesting rights percentage when the individual completes a specified period of continuous service under the compensation plan.

+ References

No definition available.

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Subsequent events (Details) - shares	1 Months Ended	12 Months Ended
Subsequent events (Details) - shares	Feb. 28, 2017	Dec. 31, 2016
Performance-based restricted stock unit awards
Subsequent events
Vesting period		3 years
Subsequent Event \| Executive members \| Time-based restricted stock unit awards
Subsequent events
Granted (in shares)	88,000
Vesting period	3 years
Subsequent Event \| Executive members \| Performance-based restricted stock unit awards
Subsequent events
Granted (in shares)	88,000
Subsequent Event \| Executive members \| Performance-based restricted stock unit awards \| Vesting not to exceed March 15, 2019
Subsequent events
Vesting percentage	66.67%
Subsequent Event \| Executive members \| Performance-based restricted stock unit awards \| Vesting on May 1, 2019
Subsequent events
Vesting percentage	8.33%
Subsequent Event \| Executive members \| Performance-based restricted stock unit awards \| Vesting quarterly after May 1, 2019
Subsequent events
Vesting percentage upon completion of continuous service	8.33%
Subsequent Event \| Non-executive personnel \| Time-based restricted stock unit awards
Subsequent events
Granted (in shares)	304,000
Vesting period	3 years