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)
9 Months Ended
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Derivatives Fair Value [Line Items]    
Number of contract designated hedges | Contract 15 14
Number of contract non-designated hedges | Contract 3 4
Non-Designated Derivative Contracts    
Derivatives Fair Value [Line Items]    
Derivative contracts notional amounts $ 2,251,000 $ 736,000
Designated Derivative Contracts    
Derivatives Fair Value [Line Items]    
Derivative contracts notional amounts 11,117,000 2,839,000
Unrealized (loss) gain on derivative $ (145,000) $ 27,000
Minimum    
Derivatives Fair Value [Line Items]    
Derivative contracts expiration period 1 month  
Maximum    
Derivatives Fair Value [Line Items]    
Derivative contracts expiration period 6 months