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Fair Value of Financial Instruments Derivative Instruments and Hedging Activities (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Foreign Exchange Forward [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax $ (192,000) $ 887,000 $ 649,000 $ 766,000
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 8,000 (9,000) 0 21,000
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 55,000 (11,000) 110,000 184,000
Interest Rate Swap [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax (101,000) 114,000 (823,000) 254,000
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 $ (14,000) $ (61,000) $ (13,000) $ (169,000)