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Employee benefit plans - Components of Net Periodic Pension Expense (Income) and Other Amounts Recognized in Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) $ 5,868 $ 7,977  
Pension Benefits      
Components of net periodic pension cost:      
Interest cost 419 544 $ 639
Expected return on plan assets (1,288) (1,236) (1,084)
Amortization of unrecognized net gain 301 218 227
Net periodic benefit (568) (474) (218)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):      
Net loss (gain) 419 544 639
Deferred tax (88) (114) (134)
Total recognized in other comprehensive loss 331 430 505
Total recognized in net period pension cost and other comprehensive loss $ (237) $ (44) $ 287