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OTHER EXPENSE , NET (Tables)
 9 Months Ended
Sep. 30, 2016
Other Income and Expenses [Abstract]  
Principal components of other expense, net
The principal components of other expense, net, are as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2016
 
2015
 
2016
 
2015
Interest and investment income
$
24

 
$
9

 
$
63

 
$
35

Income tax expense
(601
)
 
(356
)
 
(643
)
 
(475
)
Other non-operating income
—

 
—

 
126

 
—

Total other expense, net
$
(577
)
 
$
(347
)
 
$
(454
)
 
$
(440
)