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ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)
 3 Months Ended
Mar. 31, 2015
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 loss, 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, 2014
$
1,053

 
$
(8,462
)
 
$
(773
)
 
$
(8,182
)
     Other comprehensive income before reclassifications
(11,730
)
 
(325
)
 
—

 
(12,055
)
Balance as of March 31, 2015
$
(10,677
)
 
$
(8,787
)
 
$
(773
)
 
$
(20,237
)