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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income, Net of Tax
The following table summarizes the changes in accumulated balances of other comprehensive (loss) income, net of tax:
 
Foreign currency translation adjustments
 
Defined benefit pension plans
 
Change in unrealized (loss) gain on investments
 
Total
 
(in thousands)
Balance as of December 31, 2013
$
14,952

 
$
(2,153
)
 
$
(2
)
 
$
12,797

     Other comprehensive loss
(13,899
)
 
(6,309
)
 
(771
)
 
(20,979
)
     Amounts reclassified from accumulated other comprehensive income
—

 
—

 
—

 
—

            Net decrease in other comprehensive loss
(13,899
)
 
(6,309
)
 
(771
)
 
(20,979
)
Balance as of December 31, 2014
$
1,053

 
$
(8,462
)
 
$
(773
)
 
$
(8,182
)
     Other comprehensive (loss) gain
(11,342
)
 
7,096

 
(1,364
)
 
(5,610
)
     Amounts reclassified from accumulated other comprehensive loss
—

 
—

 
2,137

 
2,137

            Net (decrease) increase in other comprehensive loss
(11,342
)
 
7,096

 
773

 
(3,473
)
Balance as of December 31, 2015
$
(10,289
)
 
$
(1,366
)
 
$
—

 
$
(11,655
)