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Derivative Instruments and Hedging Activities (Tables)
 6 Months Ended
Jun. 30, 2018
Derivative Instruments And Hedging Activities Disclosure [Abstract]  
Forward Contracts and Related Fair Values

The dollar equivalent of the U.S. dollar forward exchange contracts and related fair values as of June 30, 2018 and December 31, 2017 were as follows:

 

 

 

June 30,

2018

 

 

December 31,

2017

 

Notional amount

 

$

3,734

 

 

$

8,417

 

Fair value of asset (liability)

 

$

(10

)

 

$

45