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OTHER INCOME, NET
 6 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
OTHER EXPENSE, NET
OTHER INCOME, NET
The principal components of other income, net, are as follows (in thousands):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Interest and investment income
$
23

 
$
113

 
$
163

 
$
260

Income tax (expense) benefit
(171
)
 
79

 
(106
)
 
242

Other non-operating income
—

 
—

 
4

 
—

Total other (expense) income, net
$
(148
)
 
$
192

 
$
61

 
$
502