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Consolidated Statements of Comprehensive Income - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net income $ 4,354,000 $ 1,319,000 $ 18,142,000 $ 7,371,000
Post-retirement benefit plan adjustments:        
Amortization of net actuarial loss 6,000 43,000 18,000 130,000
Amortization of prior service credits (124,000) (124,000) (372,000) (372,000)
Income tax benefit 25,000 17,000 75,000 51,000
Comprehensive income 3,720,000 1,389,000 18,311,000 7,314,000
Foreign currency hedging derivatives:        
Other comprehensive income:        
Unrealized hedge gain (loss) (898,000) (626,000) 208,000 (626,000)
Income tax benefit (expense) 192,000 159,000 (50,000) 159,000
Interest rate swaps:        
Other comprehensive income:        
Unrealized hedge gain (loss) 209,000 767,000 366,000 767,000
Income tax benefit (expense) $ (44,000) $ (166,000) $ (76,000) $ (166,000)