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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
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)