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Supplemental equity and other information - Schedule of Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning balance $ 317,785  
Other comprehensive (loss) income before reclassifications, net of taxes 6,685 $ 25,915
Amounts reclassified from accumulated other comprehensive income (loss) 244 (457)
Net current period other comprehensive (loss) income, net of tax 6,929 25,458
Ending balance 240,451  
Amounts reclassified from accumulated other comprehensive income (loss), tax impacts 107 (146)
Total    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning balance (65,541) (101,231)
Ending balance (58,612) (75,773)
Pension and postretirement benefit plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning balance (64,344) (86,351)
Other comprehensive (loss) income before reclassifications, net of taxes (6,232) 21,080
Amounts reclassified from accumulated other comprehensive income (loss) 244 (457)
Net current period other comprehensive (loss) income, net of tax (5,988) 20,623
Ending balance (70,332) (65,728)
Foreign currency translation    
Accumulated Other Comprehensive Income (Loss), Net of Tax    
Beginning balance (1,197) (14,880)
Other comprehensive (loss) income before reclassifications, net of taxes 12,917 4,835
Amounts reclassified from accumulated other comprehensive income (loss) 0 0
Net current period other comprehensive (loss) income, net of tax 12,917 4,835
Ending balance $ 11,720 $ (10,045)