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Fair Value of Financial Instruments (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Fair value of financial instruments:      
Derivative, Net Hedge Ineffectiveness Gain (Loss) $ 0 $ 0 $ 0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 517,000 (289,000) 0
Cost of Sales [Member]      
Fair value of financial instruments:      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 445,000 12,000 0
Selling, General and Administrative Expenses [Member]      
Fair value of financial instruments:      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 67,000 $ 2,000 $ 0
Assets [Member]      
Fair value of financial instruments:      
Description of Location of Foreign Currency Derivatives on Balance Sheet Prepaid expense other current assets Prepaid expense other current assets  
Foreign Currency Contract, Asset, Fair Value Disclosure $ 0 $ 0  
Derivative, Notional Amount $ 0 $ 0  
Liability [Member]      
Fair value of financial instruments:      
Description of Location of Foreign Currency Derivatives on Balance Sheet Accrued liabilities other Accrued liabilities other  
Foreign Currency Contracts, Liability, Fair Value Disclosure $ 298,000 $ 303,000  
Derivative, Notional Amount $ 8,766,000 $ 6,502,000  
Minimum [Member]      
Fair value of financial instruments:      
Derivative, Forward Exchange Rate 19.17 20.01  
Maximum [Member]      
Fair value of financial instruments:      
Derivative, Forward Exchange Rate 20.41 20.68