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Pension Benefits - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Components of net periodic benefit cost    
Service cost $ 258 $ 387
Interest cost 435 273
Expected return on plan assets (1,034) (1,050)
Amortization of net loss   500
Net periodic pension (benefit) cost $ (341) $ 110