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Fair Value Measurement (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of fair value for forward foreign exchange contracts
We record these forward foreign exchange contracts at fair value; the following tables summarize the fair value for forward foreign exchange contracts outstanding at December 31, 2017 and 2016:
December 31, 2017
Asset Fair
Value
 
Liabilities Fair
Value
 
Net
 Fair
Value
Derivatives designated as hedging instruments:
 
 
 
 
 
Foreign exchange contracts
$
346

 
$
(5,945
)
 
$
(5,599
)
 
 
 
 
 
 
Derivatives not designated as hedging instruments:
 

 
 

 
 

Foreign exchange contracts
4

 
(78
)
 
(74
)
 
 
 
 
 
 
Total derivatives
$
350

 
$
(6,023
)
 
$
(5,673
)

December 31, 2016
Asset Fair
Value
 
Liabilities Fair
Value
 
Net
 Fair
Value
Derivatives designated as hedging instruments:
 
 
 
 
 
Foreign exchange contracts
$
3,962

 
$
(1,510
)
 
$
2,452

 
 
 
 
 
 
Derivatives not designated as hedging instruments:
 
 
 
 
 
Foreign exchange contracts
48

 
(54
)
 
(6
)
 
 
 
 
 
 
Total derivatives
$
4,010

 
$
(1,564
)
 
$
2,446