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OTHER INCOME, NET (Tables)
 9 Months Ended
Sep. 30, 2017
Other Income and Expenses [Abstract]  
Principal components of other expense, net
The principal components of other income (expense), net, are as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Interest and investment income
$
111

 
$
24

 
$
371

 
$
63

Income tax benefit (expense)
(210
)
 
(601
)
 
32

 
(643
)
Other non-operating income
—

 
—

 
—

 
126

Total other income (expense), net
$
(99
)
 
$
(577
)
 
$
403

 
$
(454
)