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Share-based compensation - RSU activity (Details) - 2014 Plan - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2021
Other disclosure
Vesting period (in years)		4 years
Non-executive directors
Other disclosure
Vesting period (in years)		1 year
Restricted share units ("RSUs")
Number of shares
Non-vested at beginning of period (in shares)		467,344
Restricted stock granted (in shares)		481,821
Vested (in shares)		(145,203)
Forfeited (in shares)		(31,067)
Non-vested at end of period (in shares)		772,895
Weighted average grant-date fair value
Non-vested at beginning of period (in dollars per share)		$ 43.56
Granted (in dollars per share)		36.50
Vested (in dollars per share)		39.89
Forfeited (in dollars per share)		42.86
Non-vested at end of period (in dollars per share)		$ 39.87
Other disclosure
Total weighted average grant date fair value of RSUs granted during the period (in millions)		$ 17,600
Restricted share units ("RSUs") | Non-executive directors
Other disclosure
Vesting period (in years)	1 year
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

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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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