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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 9 Months Ended
Sep. 30, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Schedule of 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 (loss) gain
(7,535
)
 
(803
)
 
1,376

 
(6,962
)
Balance as of September 30, 2015
$
(6,482
)
 
$
(9,265
)
 
$
603

 
$
(15,144
)