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Fair Value of Financial Instruments Derivative Instruments and Hedging Activities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax $ (1,036,000) $ 299,000 $ (123,000) $ 941,000
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 7,000 21,000 29,000 19,000
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 50,000 144,000 196,000 126,000
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax 176,000 0 140,000 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 $ (50,000) $ 0 $ (108,000) $ 0