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OTHER INCOME , NET (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2013
 
2012
 
2013
 
2012
Interest and investment income
$
26

 
$
65

 
$
34

 
$
152

Income tax expense
(91
)
 
(282
)
 
(388
)
 
(500
)
Acquisition related expenses
—

 
—

 
—

 
(15
)
Other non-operating income
—

 
—

 
10

 
—

Total other income (expense), net
$
(65
)
 
$
(217
)
 
$
(344
)
 
$
(363
)