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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Components of net periodic benefit cost        
Service cost $ 358,000 $ 429,000 $ 1,073,000 $ 1,287,000
Interest cost 365,000 221,000 1,094,000 664,000
Expected return on plan assets (1,052,000) (1,004,000) (3,156,000) (3,012,000)
Amortization of net loss 341,000 610,000 1,024,000 1,829,000
Settlement charge 230,000 269,000 1,244,000 1,120,000
Net periodic pension cost $ 242,000 $ 525,000 $ 1,279,000 $ 1,888,000