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OTHER (EXPENSE) INCOME, NET
 9 Months Ended
Sep. 30, 2018
Other Income and Expenses [Abstract]  
OTHER (EXPENSE) INCOME, NET OTHER (EXPENSE) INCOME, NET
The principal components of other income, net, are as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Interest and investment income
$
46

 
$
111

 
$
209

 
$
371

Income tax (expense) benefit
(171
)
 
(210
)
 
(277
)
 
32

Other non-operating income
—

 
—

 
4

 
—

Total other (expense) income, net
$
(125
)
 
$
(99
)
 
$
(64
)
 
$
403