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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
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning balance $ 153,139  
Other comprehensive (loss) income before reclassifications 4,542 $ 81
Amounts reclassified from accumulated other comprehensive income 24 77
Net current period other comprehensive (loss) income 4,566 158
Ending balance 150,143  
Amounts reclassified from accumulated other comprehensive income (loss), tax impacts 9 35
Total    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning balance (56,164) (65,541)
Ending balance (51,598) (65,383)
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 (2,732) 770
Amounts reclassified from accumulated other comprehensive income 24 77
Net current period other comprehensive (loss) income (2,708) 847
Ending balance (57,661) (63,497)
Foreign currency translation    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning balance (1,211) (1,197)
Other comprehensive (loss) income before reclassifications 7,274 (689)
Amounts reclassified from accumulated other comprehensive income 0 0
Net current period other comprehensive (loss) income 7,274 (689)
Ending balance $ 6,063 $ (1,886)