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OTHER INCOME , NET (Tables)
 9 Months Ended
Sep. 30, 2013
Other Income and Expenses [Abstract]  
Principal components of other income (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,
 
2013
 
2012
 
2013
 
2012
Interest and investment income
$
54

 
$
177

 
$
88

 
$
329

Income tax expense
(473
)
 
(55
)
 
(861
)
 
(555
)
Acquisition related expenses
—

 
(114
)
 
—

 
(129
)
Other non-operating income
—

 
—

 
10

 
—

Total other income (expense), net
$
(419
)
 
$
8

 
$
(763
)
 
$
(355
)