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OTHER (EXPENSE) INCOME, NET
 9 Months Ended
Sep. 30, 2019
Other Income and Expenses [Abstract]  
OTHER (EXPENSE) INCOME, NET OTHER (EXPENSE) INCOME, NET
The principal components of other expense, net, are as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Interest and investment income
$
137

 
$
46

 
$
299

 
$
209

Income tax expense
(268
)
 
(171
)
 
(709
)
 
(277
)
Other non-operating income
—

 
—

 
—

 
4

Total other (expense) income, net
$
(131
)
 
$
(125
)
 
$
(410
)
 
$
(64
)