Share-based compensation - RSU activity (Details) - 2014 Plan - $ / shares	1 Months Ended	6 Months Ended
Mar. 31, 2017	Jun. 30, 2019
Non-executive directors
Other disclosure
Vesting period (in years)		4 years
Restricted share units ("RSUs")
Number of shares
Non-vested at beginning of year (in shares)		412,321
Restricted stock granted (in shares)		145,004
Vested (in shares)		(186,417)
Forfeited (in shares)		(14,516)
Non-vested at end of year (in shares)		356,392
Weighted average grant-date fair value
Non-vested at beginning of year (in dollars per share)		$ 16.49
Granted (in dollars per share)		33.62
Vested (in dollars per share)		12.78
Forfeited (in dollars per share)		12.90
Non-vested at end of year (in dollars per share)		25.55
Restricted share units ("RSUs") \| Non-executive directors
Other disclosure
Vesting period (in years)	1 year
Restricted share units ("RSUs") \| Directors and Officers
Weighted average grant-date fair value
Granted (in dollars per share)		$ 4,900,000
Minimum \| Restricted share units ("RSUs")
Other disclosure
Vesting period (in years)		1 year
Maximum \| Restricted share units ("RSUs")
Other disclosure
Vesting period (in years)		3 years

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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