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Retirement plans - Expense recognized in income statement (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Net defined benefit pension plan expense:    
Current service cost $ 3,395 $ 2,246
Past service cost 0 2,479
Net interest cost 756 648
Cost of settlement 1,059 (58)
Total net defined benefit pension plan expense $ 5,210 $ 5,315