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ACCUMULATED OTHER COMPREHENSIVE LOSS
 6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE LOSS
ACCUMULATED OTHER COMPREHENSIVE LOSS
The changes in accumulated other comprehensive loss by component and related tax effects for the six months ended June 30, 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
(27,091
)
 
(118
)
 
—

 
(27,209
)
Tax effects
5,609

 
(88
)
 
—

 
5,521

Other comprehensive loss
$
(21,482
)
 
$
(206
)
 
$
—

 
$
(21,688
)
Balance at June 30, 2018
$
(192,057
)
 
$
(352
)
 
$
(1,686
)
 
$
(194,095
)