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Fair Value of Financial Instruments Derivative Instruments and Hedging Activities (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Unrealized Loss on Foreign Currency Derivatives, before Tax $ 113,000 $ 0 $ 1,054,000 $ 0
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 32,000 0 51,000 0
Cost of Sales [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 220,000 $ 0 $ 346,000 $ 0