Quarterly report pursuant to Section 13 or 15(d)

Foreign Currency Exchange Contracts and Hedging - Additional Information (Details)

v3.8.0.1
Foreign Currency Exchange Contracts and Hedging - Additional Information (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Contract
Mar. 31, 2017
USD ($)
Contract
Derivatives Fair Value [Line Items]    
Number of contract designated hedges | Contract 26 12
Number of contract non-designated hedges | Contract 3 3
Non-Designated Derivative Contracts    
Derivatives Fair Value [Line Items]    
Derivative contracts notional amounts $ 2,397,000 $ 1,620,000
Designated Derivative Contracts    
Derivatives Fair Value [Line Items]    
Derivative contracts notional amounts 17,885,000 7,378,000
Unrealized (loss) gain on derivative $ (77,000) $ 3,000
Minimum    
Derivatives Fair Value [Line Items]    
Derivative contracts expiration period 1 month  
Maximum    
Derivatives Fair Value [Line Items]    
Derivative contracts expiration period 9 months