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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Beginning balance $ 149,638 $ 232,981 $ 152,634 $ 317,313
Other comprehensive income (loss), net of tax 8,487 [1] (403) [1] 13,053 [2] (245) [2]
Ending balance 236,589 249,270 236,589 249,270
Amounts reclassified from accumulated other comprehensive income, tax impacts     29 68
Total        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Beginning balance (51,598) (65,383) (56,164) (65,541)
Other comprehensive (loss) income before reclassifications     12,971 (396)
Amounts reclassified from accumulated other comprehensive income     82 151
Other comprehensive income (loss), net of tax 8,487 [1] (403) [1] 13,053 [2] (245) [2]
Ending balance (43,111) (65,786) (43,111) (65,786)
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     (8,851) 516
Amounts reclassified from accumulated other comprehensive income     82 151
Other comprehensive income (loss), net of tax     (8,769) 667
Ending balance (63,722) (63,677) (63,722) (63,677)
Foreign currency translation        
Accumulated Other Comprehensive Income (Loss), Net of Tax        
Beginning balance     (1,211) (1,197)
Other comprehensive (loss) income before reclassifications     21,822 (912)
Other comprehensive income (loss), net of tax     21,822 (912)
Ending balance $ 20,611 $ (2,109) $ 20,611 $ (2,109)
[1] For the three months ended June 30, 2025 and 2024, Other comprehensive (loss) income is net of an income tax benefit of $1.5 million and $30 thousand, respectively.
[2] For the six months ended June 30, 2025 and 2024, Other comprehensive (loss) income is net of an income tax benefit of $2.2 million and income tax provision of $0.1 million, respectively.