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Fair Value of Financial Instruments Derivative Instruments and Hedging Activities (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Foreign Exchange Forward [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Loss on Foreign Currency Derivatives, before Tax $ 701,000 $ 913,000
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 31,000 22,000
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 148,000 146,000
Interest Rate Swap [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Unrealized Loss on Foreign Currency Derivatives, before Tax (252,000) 24,000
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 $ 1,000 $ 0