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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net income $ 12,203 $ 4,671 $ 8,165
Post retirement benefit plan adjustments:      
Net actuarial gain 2,309 89 283
Prior service costs (496) (496) (496)
Income tax benefit (expense) (381) 107 27
Comprehensive income 14,181 4,371 8,170
Foreign currency hedging derivatives:      
Foreign currency hedging derivatives:      
Unrealized hedge gain (loss) (85) 0 (452)
Income tax benefit 27 0 98
Interest rate hedging derivatives:      
Foreign currency hedging derivatives:      
Unrealized hedge gain (loss) 765 0 705
Income tax benefit $ (161) $ 0 $ (160)