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Pension Benefits - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Components of net periodic benefit cost        
Service cost $ 363,000 $ 427,000 $ 727,000 $ 854,000
Interest cost 349,000 225,000 697,000 450,000
Expected return on plan assets (1,045,000) (992,000) (2,091,000) (1,985,000)
Amortization of net loss 364,000 621,000 728,000 1,243,000
Settlement charge 1,014,000 851,000 1,014,000 851,000
Net periodic pension cost $ 1,045,000 $ 1,132,000 $ 1,075,000 $ 1,413,000