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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net income $ 1,688,000 $ 2,890,000
Other comprehensive income:    
Unrealized Gain on Foreign Currency Derivatives, before Tax 662,000 0
Unrealized Foreign Currency Hedge Gain (Loss), Tax (225,000) 0
Interest rate swaps:    
Adjustment for amortization of losses included in net income 0 5,000
Income tax expense 0 2,000
Post retirement benefit plan adjustments:    
Net actuarial loss 37,000 39,000
Prior service costs (124,000) (124,000)
Income tax benefit 27,000 26,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 2,065,000 $ 2,834,000