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Pension Benefits - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Components of net periodic benefit cost        
Service cost $ 258 $ 363 $ 516 $ 727
Interest cost 435 349 870 697
Expected return on plan assets (1,034) (1,045) (2,068) (2,091)
Amortization of net loss   364   728
Settlement charge 0 1,014 0 1,014
Net periodic pension (benefit) cost $ (341) $ 1,045 $ (682) $ 1,075