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Pension Benefits - Component of net periodic benefit cost (Details) - Pension Plan - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
COMPONENTS OF NET PERIODIC PENSION BENEFIT:        
Service cost $ 162,000 $ 211,000 $ 536,000 $ 628,000
Interest cost 413,000 369,000 1,145,000 1,173,000
Expected return on plan assets (1,032,000) (1,051,000) (3,112,000) (3,119,000)
Settlement charge 0 34,000 0 410,000
Net periodic pension benefit $ (457,000) $ (437,000) $ (1,431,000) $ (908,000)