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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net income $ 7,961,000 $ (3,845,000)
Other comprehensive income:    
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax (1,674,000) 524,000
Unrealized Foreign Currency Hedge Gain (Loss), Tax 360,000 (134,000)
Interest rate swaps:    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 783,000 254,000
Income tax benefit (178,000) (58,000)
Post retirement benefit plan adjustments:    
Net actuarial gain 45,000 29,000
Prior service costs (124,000) (124,000)
Income tax benefit 17,000 20,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 5,980,000 $ (3,726,000)