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Fair Value of Financial Instruments Derivative Instruments and Hedging Activities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax $ 354,000 $ (1,036,000) $ 841,000 $ (123,000)
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 (4,000) 7,000 8,000 29,000
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 (79,000) 50,000 (55,000) 196,000
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax (470,000) 176,000 (722,000) 140,000
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) $ (50,000) $ 0 $ (108,000)