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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net income (loss) $ (3,312) $ 3,343 $ 4,230 $ 9,032
Post-retirement benefit plan adjustments:        
Amortization of net actuarial loss 43 46 130 136
Amortization of prior service credits (124) (124) (372) (372)
Income tax benefit 18 17 51 50
Comprehensive income (loss) (3,375) 3,742 4,039 8,063
Foreign currency hedging derivatives:        
Foreign currency hedging derivatives:        
Unrealized hedge gain (loss) 0 415 0 (456)
Income tax benefit (expense) 0 (88) 0 98
Interest rate swaps:        
Foreign currency hedging derivatives:        
Unrealized hedge gain (loss) 0 172 0 (550)
Income tax benefit (expense) $ 0 $ (39) $ 0 $ 125