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Share-based compensation - Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended
	Mar. 01, 2014	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based compensation
Income tax benefit from compensation expense		$ 500,000	$ 400,000	$ 1,600,000	$ 1,500,000
Restricted stock units
Share-based compensation
Fair value of vested stock				3,700,000	4,200,000
Income tax benefit from compensation expense				800,000	600,000
Unrecognized share based compensation		5,200,000		$ 5,200,000
Weighted average period for recognition of unrecognized compensation cost (in years)				1 year 10 months 24 days
Long-term Incentive Plan
Share-based compensation
Payment award, low end of range				0.00%
Payment award, high end of range				200.00%
Measurement period for total return to shareholders (in years)				3 years
Award performance period (in years)				3 years
LTIP linked to TRS
Share-based compensation
Fair value of vested stock				$ 0	800,000
Income tax benefit from compensation expense					100,000
Unrecognized share based compensation		1,600,000		$ 1,600,000
Weighted average period for recognition of unrecognized compensation cost (in years)				1 year 2 months 12 days
LTIP awards linked to other performance conditions
Share-based compensation
Fair value of vested stock				$ 2,900,000	3,200,000
Income tax benefit from compensation expense				600,000	$ 400,000
Unrecognized share based compensation		$ 5,400,000		$ 5,400,000
Weighted average period for recognition of unrecognized compensation cost (in years)				1 year 2 months 12 days
Equity and Incentive Plan
Share-based compensation
Number of additional shares authorized (in shares)	1,500,000
Shares available for future issuance (in shares)		2,700,000		2,700,000
Number of share issuable upon vesting and achievement of performance goals (in shares)		700,000		700,000
Nonemployee Director Stock Plan
Share-based compensation
Shares available for future grant (in shares)		168,177		168,177

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- Definition

Represents the number of years used in the calculation of total return to shareholders.

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Represents the high end of range of payout depending on achievement of the goals.

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Represents the low end of range of payout depending on achievement of the goals.

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Represents the number of shares that could be issued upon vesting of share-based payment awards and achievement of performance goals.

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Represents the number of authorized but unissued shares that could be issued under the equity-based compensation plan.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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