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Accumulated other comprehensive loss - Reclassifications out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, before tax $ 1,085 $ 1,353 $ (18,739) $ 2,578
Income tax effect (279) (348) 4,850 (664)
Total reclassifications, net of tax 806 1,005 (13,889) 1,914
Amortization of prior service credit, net        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, before tax (123) (266) (248) (241)
Amortization of actuarial loss        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, before tax 1,208 1,619 2,309 2,819
Realized gain on available-for-sale investment        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, before tax $ 0 $ 0 $ (20,800) $ 0