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Pension Benefits - Component of net periodic benefit cost (Details) - Defined Benefit Pension Items - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Components of net periodic benefit cost        
Service cost $ 429,000 $ 419,000 $ 1,287,000 $ 1,257,000
Interest cost 221,000 320,000 664,000 960,000
Expected return on plan assets (1,004,000) (811,000) (3,012,000) (2,433,000)
Recognized net actuarial loss 610,000 611,000 1,829,000 1,833,000
Settlement charge 269,000   1,120,000  
Net periodic pension cost $ 525,000 $ 539,000 $ 1,888,000 $ 1,617,000