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Consolidated Statement of Stockholders' Equity (Unaudited) - Parenthetical - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]        
Tax effect of change in post retirement benefits $ 20,000 $ 17,000 $ 60,000 $ 51,000
Unrealized Foreign Currency Hedge Gain (Loss), Tax 58,000 (202,000) (144,000) (156,000)
Unrealized Interest Rate Swap Gain (Loss), Tax $ 106,000 $ (40,000) $ 184,000 $ (97,000)