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Supplemental equity and other information - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |
Beginning balance | $ 317,785 |
Other comprehensive income (loss) before reclassifications, net of taxes | (396) | $ 27,506
Amounts reclassified from accumulated other comprehensive income | 151 | 31
Net current period other comprehensive income (loss), net of tax | (245) | 27,537
Ending balance | 249,773 |
Amounts reclassified from accumulated other comprehensive income | 68 | 14
Total |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |
Beginning balance | (65,541) | (101,231)
Ending balance | (65,786) | (73,694)
Pension and postretirement benefit plans |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |
Beginning balance | (64,344) | (86,351)
Other comprehensive income (loss) before reclassifications, net of taxes | 516 | 15,342
Amounts reclassified from accumulated other comprehensive income | 151 | 31
Net current period other comprehensive income (loss), net of tax | 667 | 15,373
Ending balance | (63,677) | (70,978)
Foreign currency translation |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  |
Beginning balance | (1,197) | (14,880)
Other comprehensive income (loss) before reclassifications, net of taxes | (912) | 12,164
Amounts reclassified from accumulated other comprehensive income | 0 | 0
Net current period other comprehensive income (loss), net of tax | (912) | 12,164
Ending balance | $ (2,109) | $ (2,716)

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