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Share-based compensation - Narrative (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Mar. 01, 2014 | Mar. 31, 2024 | Mar. 31, 2023
Share-based compensation |  |  |
Income tax benefit from compensation expense |  | $ 100,000 | $ 300,000
Restricted stock units |  |  |
Share-based compensation |  |  |
Fair value of vested stock |  | 1,400,000 | 3,600,000
Income tax benefit from compensation expense |  | 300,000 | 800,000
Unrecognized share based compensation |  | $ 3,400,000 |
Weighted average period for recognition of unrecognized compensation cost (in years) |  | 1 year 7 months 6 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 | 0
Unrecognized share based compensation |  | $ 2,100,000 |
Weighted average period for recognition of unrecognized compensation cost (in years) |  | 2 years 1 month 6 days |
LTIP awards linked to other performance conditions |  |  |
Share-based compensation |  |  |
Fair value of vested stock |  | $ 1,700,000 | 2,900,000
Income tax benefit from compensation expense |  | 400,000 | $ 600,000
Unrecognized share based compensation |  | $ 7,800,000 |
Weighted average period for recognition of unrecognized compensation cost (in years) |  | 2 years 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) |  | 2,500,000 |
Number of share issuable upon vesting and achievement of performance goals (in shares) |  | 900,000 |
Nonemployee Director Stock Plan |  |  |
Share-based compensation |  |  |
Shares available for future grant (in shares) |  | 168,177 |

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