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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Components of net periodic benefit cost        
Service cost $ 427,000 $ 441,000 $ 854,000 $ 882,000
Interest cost 225,000 319,000 450,000 638,000
Expected return on plan assets (992,000) (817,000) (1,985,000) (1,634,000)
Recognized net actuarial loss 621,000 648,000 1,243,000 1,296,000
Settlement charge 851,000   851,000  
Net periodic pension cost $ 1,132,000 $ 591,000 $ 1,413,000 $ 1,182,000