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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
 9 Months Ended
Sep. 30, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Components of accumulated other comprehensive income, net of tax
The following table summarizes the changes in accumulated balances of other comprehensive income, net of tax:
 
Foreign currency translation adjustments
 
Defined benefit pension plans
 
Change in unrealized loss on investments
 
Total
 
(in thousands)
Balance as of December 31, 2013
$
14,952

 
$
(2,153
)
 
$
(2
)
 
$
12,797

     Other comprehensive income before reclassifications
(7,860
)
 
—

 
—

 
(7,860
)
     Amounts reclassified from accumulated other comprehensive income
—

 
(56
)
 
328

 
272

            Net increase in other comprehensive income
(7,860
)
 
(56
)
 
328

 
(7,588
)
Balance as of September 30, 2014
$
7,092

 
$
(2,209
)
 
$
326

 
$
5,209