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Supplemental equity and other information - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Beginning balance $ 236,589 $ 249,270 $ 152,634 $ 317,313
Other comprehensive (loss) income, net of tax (4,579) [1] 7,174 [1] 8,474 [2] 6,929 [2]
Ending balance 193,511 239,947 193,511 239,947
Amounts reclassified from accumulated other comprehensive income, tax impacts     49 107
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Beginning balance (43,111) (65,786) (56,164) (65,541)
Other comprehensive (loss) income before reclassifications     8,328 6,685
Amounts reclassified from accumulated other comprehensive income     146 244
Other comprehensive (loss) income, net of tax (4,579) [1] 7,174 [1] 8,474 [2] 6,929 [2]
Ending balance (47,690) (58,612) (47,690) (58,612)
Pension and postretirement benefit plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Beginning balance     (54,953) (64,344)
Other comprehensive (loss) income before reclassifications     (7,528) (6,232)
Amounts reclassified from accumulated other comprehensive income     146 244
Other comprehensive (loss) income, net of tax     (7,382) (5,988)
Ending balance (62,335) (70,332) (62,335) (70,332)
Foreign currency translation        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Beginning balance     (1,211) (1,197)
Other comprehensive (loss) income before reclassifications     15,856 12,917
Amounts reclassified from accumulated other comprehensive income     0 0
Other comprehensive (loss) income, net of tax     15,856 12,917
Ending balance $ 14,645 $ 11,720 $ 14,645 $ 11,720
[1] For the three months ended September 30, 2025 and 2024, Other comprehensive (loss) income is net of an income tax provision of $0.6 million and an income tax benefit of $1.6 million, respectively.
[2] For the nine months ended September 30, 2025 and 2024, Other comprehensive (loss) income is net of an income tax benefit of $1.6 million and $1.5 million, respectively.