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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net income $ 13,299 $ 20,324 $ 12,203
Post retirement benefit plan adjustments:      
Net actuarial gain (loss) (740) 3,026 2,309
Prior service costs (496) (496) (496)
Income tax benefit (expense) 382 (637) (381)
Comprehensive income 10,290 22,572 14,181
Foreign currency hedging derivatives:      
Foreign currency hedging derivatives:      
Unrealized hedge gain(loss) (2,700) 706 (85)
Income tax benefit (expense) 571 (161) 27
Interest rate hedging derivatives:      
Foreign currency hedging derivatives:      
Unrealized hedge gain(loss) (33) (240) 765
Income tax benefit (expense) $ 7 $ 50 $ (161)