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Share-based compensation plans - Additional Information (Details) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) installment $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant (in shares) | shares | 2,224,042 |  |
Compensation cost for share-based payment arrangements | $ 26,948 | $ 24,738 | $ 28,302
Related tax benefit recognized in net income | 6,852 | 6,162 | 7,231
Additional net excess tax benefit realized | $ 257 | $ 978 | $ 1,367
2024 PCSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Capital shares reserved for future issuance (in shares) | shares | 2,900,000 |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted, weighted-average grant date fair value (usd per share) | $ / shares | $ 52.41 |  |
Vested units in period (in shares) | shares | 0 |  |
Performance Contingent Restricted Stock Units (PCSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Minimum vesting period | 3 years |  |
Granted, weighted-average grant date fair value (usd per share) | $ / shares | $ 50.54 | $ 55.04 | $ 51.94
Noncash stock-based compensation associated performance contingent restricted stock units | $ 10,176 | $ 9,826 | $ 16,686
Total unrecognized compensation cost related to nonvested awards | $ 7,873 |  |
Weighted-average period | 21 months |  |
Performance period | 3 years |  |
Stock return payout percentage | 0.20 |  |
Vested units in period (in shares) | shares | 0 |  |
Performance Contingent Restricted Stock Units (PCSUs) | 2024 PCSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period | 3 years |  |
Stock return payout percentage | 0.20 |  |
Total performance contingent restricted stock units vested , minimum (in shares) | shares | 0 |  |
Total performance contingent restricted stock units, maximum (in shares) | shares | 517,066 |  |
Performance Contingent Restricted Stock Units (PCSUs) | 2023 PCSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance period |  | 3 years |
Stock return payout percentage |  | 0.20 |
Total performance contingent restricted stock units vested , minimum (in shares) | shares |  | 0 |
Total performance contingent restricted stock units, maximum (in shares) | shares |  | 410,100 |
Performance Contingent Restricted Stock Units (PCSUs) | 2022 PCSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of vested units | $ 16,164 |  |
Total performance contingent restricted stock units, maximum (in shares) | shares | 330,888 |  |
Performance Contingent Restricted Stock Units (PCSUs) | 2021 PCSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of vested units |  | $ 12,600 |
Vested units in period (in shares) | shares |  | 225,530 |
Performance Contingent Restricted Stock Units (PCSUs) | 2020 PCSU |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value of vested units |  |  | $ 17,052
Vested units in period (in shares) | shares |  |  | 280,881
Performance Contingent Restricted Stock Units (PCSUs) | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 25.00% |  |
Performance Contingent Restricted Stock Units (PCSUs) | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 75.00% |  |
Deferred Compensation Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation deferrals in current year | $ 2,024 | $ 2,024 | $ 2,256
Stock Appreciation Rights (SARs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation cost for share-based payment arrangements |  | 0 | 40
Total unrecognized compensation cost related to nonvested awards | $ 0 |  |
Vesting percentage | 33.33% |  |
Weighted average remaining contractual life for SAR's, outstanding | 4 years 2 months 12 days |  |
Aggregate intrinsic value of options and SARs exercised | $ 74 | $ 158 | $ 582
Aggregate intrinsic value for SAR's, outstanding | $ 376 |  |
Fair market value of the Company’s stock used to calculate intrinsic value (usd per share) | $ / shares | $ 48.85 |  |
Executive Officers and Key Management Employees | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Minimum vesting period | 3 years |  |
Executive Officers and Key Management Employees | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 33.33% |  |
Executive Officers and Key Management Employees | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 33.33% |  |
Executive Officers and Key Management Employees | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 33.33% |  |
Executives and Directors | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Minimum vesting period | 5 years |  |
Granted, weighted-average grant date fair value (usd per share) | $ / shares | $ 52.41 | $ 56.87 | $ 53.55
Fair value of vested units | $ 13,190 | $ 10,320 | $ 6,243
Noncash stock-based compensation associated performance contingent restricted stock units | 14,748 | $ 12,888 | $ 9,320
Total unrecognized compensation cost related to nonvested awards | $ 11,657 |  |
Weighted-average period | 24 months |  |
Executives and Directors | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 33.33% |  |
Executives and Directors | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Four |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 33.33% |  |
Executives and Directors | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Five |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting percentage | 33.33% |  |
Non-employee directors | Deferred Compensation Plans | Share-based Compensation Award, Tranche One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of annual distribution installments | installment | 1 |  |
Non-employee directors | Deferred Compensation Plans | Share-based Compensation Award, Tranche Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of annual distribution installments | installment | 3 |  |
Non-employee directors | Deferred Compensation Plans | Share-based Compensation Award, Tranche Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of annual distribution installments | installment | 5 |  |

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