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Accumulated Other Comprehensive Income (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,609,000 $ 2,666,000 $ 2,609,000 $ 2,666,000 $ 2,070,000 $ 2,414,000
Unrealized Loss on Foreign Currency Derivatives, before Tax     1,020,000 1,054,000    
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Before Tax     (279,000) (657,000)    
Unrealized Foreign Currency Hedge Gain (Loss), Tax (202,000) 48,000 (156,000) (223,000)    
Other Comprehensive Income (Loss), Tax     (202,000) (145,000)    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,075,000 2,432,000 2,075,000 2,432,000 2,267,000 2,614,000
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     (243,000) (260,000)    
Other Comprehensive Income (Loss), Tax     51,000 78,000    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 534,000 $ 234,000 534,000 234,000 $ (197,000) $ (200,000)
Unrealized Loss on Foreign Currency Derivatives, before Tax     1,020,000 1,054,000    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     (36,000) (397,000)    
Unrealized Foreign Currency Hedge Gain (Loss), Tax     $ (253,000)      
Other Comprehensive Income (Loss), Tax       $ (223,000)