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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, before tax | $ 1,327 | $ 1,085 | $ 2,777 | $ (18,739)
Income tax effect | (339) | (279) | (711) | 4,850
Total reclassifications, net of tax | 988 | 806 | 2,066 | (13,889)
Amortization of prior service credit, net |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, before tax | (107) | (123) | (232) | (248)
Amortization of actuarial loss |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, before tax | 1,434 | 1,208 | 3,009 | 2,309
Realized gain on available-for-sale investment |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total reclassifications, before tax | $ 0 | $ 0 | $ 0 | $ (20,800)

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