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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef
-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=109197908&loc=d3e5070-113901

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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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Subsequent events (Details) - shares	1 Months Ended		12 Months Ended
Subsequent events (Details) - shares	Feb. 28, 2019	Feb. 28, 2018	Dec. 31, 2018
Performance-based restricted stock unit awards
Subsequent events
Granted (in shares)		584,000
Vesting period			3 years
Subsequent events \| Executive members \| Time-based restricted stock unit awards
Subsequent events
Granted (in shares)	93,000
Vesting period	3 years
Subsequent events \| Executive members \| Performance-based restricted stock unit awards
Subsequent events
Granted (in shares)	80,000
Subsequent events \| Non-executive personnel \| Time-based restricted stock unit awards
Subsequent events
Granted (in shares)	205,000
Vesting period	3 years