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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Consolidated Statements of Comprehensive Income (Loss)        
Net income (loss) $ 3,343,000 $ (6,125,000) $ 9,032,000 $ (9,761,000)
Post retirement benefit plan adjustments:        
Net actuarial gain 46,000 28,000 136,000 88,000
Prior service costs (124,000) (122,000) (372,000) (372,000)
Income tax benefit (expense), Post retirement benefits 17,000 20,000 50,000 60,000
Comprehensive income (loss) 3,742,000 (6,462,000) 8,063,000 (10,215,000)
Foreign currency hedging derivatives [Member]        
Foreign currency hedging derivatives & Interest rate swaps:        
Unrealized hedge gain (loss) 415,000 (254,000) (456,000) 539,000
Income tax benefit (expense) 88,000 (58,000) (98,000) 144,000
Interest Rate Swaps [Member]        
Foreign currency hedging derivatives & Interest rate swaps:        
Unrealized hedge gain (loss) 172,000 (87,000) (550,000) (809,000)
Income tax benefit (expense) $ 39,000 $ (20,000) $ (125,000) $ (184,000)