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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income (loss) $ 4,671 $ 8,165 $ (15,223)
Post retirement benefit plan adjustments:      
Net actuarial gain (loss) 89 283 (985)
Prior service costs (496) (496) (496)
Income tax benefit 107 27 313
Comprehensive income (loss) 4,371 8,170 (15,970)
Foreign currency hedging derivatives:      
Foreign currency hedging derivatives:      
Unrealized hedge gain (loss) 0 (452) 1,202
Income tax benefit (expense) 0 98 (286)
Interest rate hedging derivatives:      
Foreign currency hedging derivatives:      
Unrealized hedge gain (loss) 0 705 (641)
Income tax benefit (expense) $ 0 $ (160) $ 146