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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Components of net periodic benefit cost        
Service cost $ 327,000 $ 358,000 $ 841,000 $ 1,073,000
Interest cost 514,000 365,000 1,384,000 1,094,000
Expected return on plan assets (1,124,000) (1,052,000) (3,192,000) (3,156,000)
Amortization of net loss 29,000 341,000 29,000 1,024,000
Settlement charge 0 230,000 0 1,244,000
Net periodic pension (benefit) cost $ (254,000) $ 242,000 $ (938,000) $ 1,279,000