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Fair Value of Financial Instruments Derivative Instruments and Hedging Activities (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax $ 887,000 $ 113,000 $ 766,000 $ 1,054,000
Foreign Exchange Forward [Member] | Selling, General and Administrative Expenses [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (9,000) 32,000 21,000 51,000
Foreign Exchange Forward [Member] | Cost of Sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (11,000) 220,000 184,000 346,000
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax 114,000 0 254,000 0
Interest Rate Swap [Member] | Interest Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (61,000) $ 0 $ (169,000) $ 0