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OTHER INCOME, NET
 12 Months Ended
Dec. 31, 2017
Other Income and Expenses [Abstract]  
OTHER INCOME, NET
OTHER INCOME, NET
Other income, net for the years ended December 31, 2017, 2016 and 2015 consisted of the following (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Interest income, net
$
4,189

 
$
1,724

 
$
622

Transaction gain (loss) on foreign exchange
258

 
(175
)
 
(687
)
Other non-operating income, net
417

 
145

 
451

Other income, net
$
4,864

 
$
1,694

 
$
386