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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Net income $ 20,324 $ 12,203 $ 4,671
Post retirement benefit plan adjustments:      
Net actuarial gain 3,026 2,309 89
Prior service costs (496) (496) (496)
Income tax benefit (expense) (637) (381) 107
Comprehensive income 22,572 14,181 4,371
Foreign currency hedging derivatives:      
Foreign currency hedging derivatives:      
Unrealized hedge gain (loss) 706 (85) 0
Income tax benefit (expense) (161) 27 0
Interest rate hedging derivatives:      
Foreign currency hedging derivatives:      
Unrealized hedge gain (loss) (240) 765 0
Income tax benefit (expense) $ 50 $ (161) $ 0