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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net income $ 2,162,000 $ 1,460,000 $ 3,848,000 $ 4,350,000
Other comprehensive income:        
Unrealized Gain on Foreign Currency Derivatives, before Tax 134,000 0 796,000 0
Unrealized Foreign Currency Hedge Gain (Loss), Tax (46,000) 0 (271,000) 0
Interest rate swaps:        
Adjustment for amortization of losses included in net income 0 0 5,000
Income tax expense 0 0 2,000
Post retirement benefit plan adjustments:        
Net actuarial loss 38,000 39,000 75,000 78,000
Prior service costs (124,000) (124,000) (248,000) (248,000)
Income tax benefit 25,000 25,000 52,000 51,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 2,189,000 $ 1,400,000 $ 4,252,000 $ 4,234,000