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Consolidated Statements of Comprehensive Income - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net income $ 7,936,000 $ 2,188,000 $ 13,788,000 $ 6,052,000
Post-retirement benefit plan adjustments:        
Amortization of net actuarial loss 5,000 45,000 11,000 87,000
Amortization of prior service credits (124,000) (125,000) (248,000) (248,000)
Income tax benefit 25,000 17,000 50,000 34,000
Comprehensive income 8,691,000 2,125,000 14,591,000 5,925,000
Foreign currency hedging derivatives:        
Other comprehensive income:        
Unrealized hedge gain 620,000 0 1,107,000 0
Income tax benefit (137,000) 0 (241,000) 0
Interest rate swaps:        
Other comprehensive income:        
Unrealized hedge gain 463,000 0 156,000 0
Income tax benefit $ (97,000) $ 0 $ (32,000) $ 0