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Pension Benefits - Component of net periodic benefit cost (Details) - Pension Plan - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
COMPONENTS OF NET PERIODIC BENEFIT COST:        
Service cost $ 187,000 $ 167,000 $ 374,000 $ 417,000
Interest cost 366,000 375,000 732,000 804,000
Expected return on plan assets (1,040,000) (1,036,000) (2,080,000) (2,068,000)
Settlement charge 0 376,000 0 376,000
Net periodic pension benefit $ (487,000) $ (118,000) $ (974,000) $ (471,000)