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Accumulated Other Comprehensive Income (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 1,663,000   $ 1,663,000   $ 2,117,000  
Unrealized Foreign Currency Hedge Gain (Loss), Tax 58,000 $ (202,000) (144,000) $ (156,000)    
Derivative [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax (842,000) 534,000 (842,000) 534,000 (612,000) $ (197,000)
Unrealized Loss on Foreign Currency Derivatives, before Tax     (174,000) 1,020,000    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     (96,000) (36,000)    
Other Comprehensive Income (Loss), Tax     40,000 (253,000)    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,505,000 2,075,000 2,505,000 2,075,000 2,729,000 2,267,000
Unrealized Loss on Foreign Currency Derivatives, before Tax     0 0    
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Before Tax     284,000 243,000    
Other Comprehensive Income (Loss), Tax     60,000 51,000    
Accumulated Other Comprehensive Income            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 1,663,000 $ 2,609,000 1,663,000 2,609,000 $ 2,117,000 $ 2,070,000
Unrealized Loss on Foreign Currency Derivatives, before Tax     (174,000) 1,020,000    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax     (380,000) (279,000)    
Other Comprehensive Income (Loss), Tax     $ 100,000 $ (202,000)