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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net income $ 445,000 $ 2,162,000 $ 963,000 $ 3,848,000
Other comprehensive income:        
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax (1,092,000) 134,000 (348,000) 796,000
Unrealized Foreign Currency Hedge Gain (Loss), Tax 200,000 (46,000) 47,000 (271,000)
Interest rate swaps:        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax (224,000) 0 (248,000) 0
Income tax expense 50,000 0 57,000 0
Post retirement benefit plan adjustments:        
Net actuarial loss 43,000 38,000 86,000 75,000
Prior service costs (124,000) (124,000) (248,000) (248,000)
Income tax benefit 17,000 25,000 34,000 52,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ (337,000) $ 2,189,000 $ 725,000 $ 4,252,000