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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of accumulated other comprehensive loss
The changes in accumulated other comprehensive loss by component and related tax effects for the three months ended March 31, 2018 were as follows (in thousands):    
 
Foreign Currency Translation
 
Unrealized Losses on Available-For-Sale Securities
 
Unfunded Pension Liability
 
Total
Balance at January 1, 2018
$
(170,575
)
 
$
(146
)
 
$
(1,686
)
 
$
(172,407
)
Other comprehensive loss before tax effects
(16,551
)
 
(115
)
 
—

 
(16,666
)
Tax effects
—

 
(80
)
 
—

 
(80
)
Other comprehensive loss
$
(16,551
)
 
$
(195
)
 
$
—

 
$
(16,746
)
Balance at March 31, 2018
$
(187,126
)
 
$
(341
)
 
$
(1,686
)
 
$
(189,153
)