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Accumulated Other Comprehensive Income (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 2,666,000 $ 2,513,000 $ 2,666,000 $ 2,513,000 $ 2,414,000 $ 2,645,000
Unrealized Loss on Foreign Currency Derivatives, before Tax     1,054,000 67,000    
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Before Tax     (657,000) (251,000)    
Unrealized Foreign Currency Hedge Gain (Loss), Tax 48,000 (23,000) (223,000) (23,000)    
Other Comprehensive Income (Loss), Tax     (145,000) 52,000    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax 2,432,000 2,469,000 2,432,000 2,469,000 2,614,000 2,645,000
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     (260,000) (251,000)    
Other Comprehensive Income (Loss), Tax     78,000 75,000    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 234,000 $ 44,000 234,000 44,000 $ (200,000) $ 0
Unrealized Loss on Foreign Currency Derivatives, before Tax     1,054,000 67,000    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net     (397,000) 0    
Unrealized Foreign Currency Hedge Gain (Loss), Tax     $ (223,000)      
Other Comprehensive Income (Loss), Tax       $ (23,000)