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Accumulated Other Comprehensive Income (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,236,000   $ 2,117,000  
Unrealized Foreign Currency Hedge Gain (Loss), Tax (134,000) $ (162,000)    
Derivative [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (418,000) 410,000 (612,000) $ (197,000)
Unrealized Loss on Foreign Currency Derivatives, before Tax 449,000 937,000    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (179,000) (168,000)    
Other Comprehensive Income (Loss), Tax (76,000) (162,000)    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,654,000 2,203,000 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 95,000 81,000    
Other Comprehensive Income (Loss), Tax 20,000 17,000    
Accumulated Other Comprehensive Income        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,236,000 2,613,000 $ 2,117,000 $ 2,070,000
Unrealized Loss on Foreign Currency Derivatives, before Tax 449,000 937,000    
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax (274,000) (249,000)    
Other Comprehensive Income (Loss), Tax $ (56,000) $ (145,000)