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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net income $ 3,456 $ 7,961
Post retirement benefit plan adjustments:    
Net actuarial gain 43 45
Prior service costs (124) (124)
Income tax benefit 17 17
Comprehensive income 3,392 5,980
Foreign currency hedging derivatives:    
Foreign currency hedging derivatives:    
Unrealized hedge loss 0 (1,674)
Income tax benefit 0 (360)
Interest rate swaps:    
Foreign currency hedging derivatives:    
Unrealized hedge loss 0 (783)
Income tax benefit $ 0 $ (178)