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Accumulated Other Comprehensive Income (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,513,000 $ 2,668,000 $ 2,513,000 $ 2,668,000 $ 2,645,000 $ 2,830,000
Unrealized Loss on Foreign Currency Derivatives, before Tax     67,000 0    
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Before Tax     (251,000) (230,000)    
Unrealized Foreign Currency Hedge Gain (Loss), Tax (23,000) 0 (23,000) 0    
Other Comprehensive Income (Loss), Tax     52,000 68,000    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,469,000 2,668,000 2,469,000 2,668,000 2,645,000 2,830,000
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     (251,000) (230,000)    
Other Comprehensive Income (Loss), Tax     75,000 68,000    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 44,000 $ 0 44,000 0 $ 0 $ 0
Unrealized Loss on Foreign Currency Derivatives, before Tax     67,000 0    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     0 0    
Unrealized Foreign Currency Hedge Gain (Loss), Tax     $ (23,000)      
Other Comprehensive Income (Loss), Tax       $ 0