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ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)
 12 Months Ended
Dec. 31, 2017
ACCUMULATED OTHER COMPREHENSIVE LOSS [Abstract]  
Components of accumulated other comprehensive loss
The components of accumulated other comprehensive loss as of December 31, 2017, 2016 and 2015 are summarized below:


  
2017
  
2016
  
2015
 
          
Foreign currency translation adjustment
 
$
(16,537
)
 
$
(28,976
)
 
$
(19,305
)
Unrealized holding gain on available-for-sale
            
   securities, net of taxes of $85, $263 and $265 as of
            
   December 31, 2017, 2016 and 2015
  
145
   
424
   
434
 
Unfunded SERP liability, net of taxes of ($1,635), ($1,398)
            
   and ($1,327) as of December 31, 2017, 2016 and 2015
  
(3,233
)
  
(2,745
)
  
(3,005
)
             
Accumulated other comprehensive loss
 
$
(19,625
)
 
$
(31,297
)
 
$
(21,876
)
Changes in accumulated other comprehensive (loss) income by component
Changes in accumulated other comprehensive (loss) income by component during the years ended December 31, 2017 and 2016 are as follows.  All amounts are net of tax.

 
    
Unrealized Holding
    
 
   
 
 
Foreign Currency
  
Gains on
    
 
   
 
 
Translation
  
Available-for-
  
Unfunded
 
 
   
 
 
Adjustment
  
Sale Securities
  
SERP Liability
 
 
 
Total
 
 
         
 
   
Balance at January 1, 2016
 
$
(19,305
)
 
$
434
  
$
(3,005
)
 
 
$
(21,876
)
     Other comprehensive income (loss) before reclassifications
  
(9,671
)
  
(10
)
  
5
 
 
  
(9,676
)
     Amounts reclassified from accumulated other
            
 
    
          comprehensive income (loss)
  
-
   
-
   
255
 
 (a)
  
255
 
     Net current period other comprehensive income (loss)
  
(9,671
)
  
(10
)
  
260
 
 
  
(9,421
)
 
            
 
    
Balance at December 31, 2016
  
(28,976
)
  
424
   
(2,745
)
 
  
(31,297
)
 
            
 
    
     Other comprehensive income (loss) before reclassifications
  
12,439
   
(279
)
  
(733
)
 
  
11,427
 
     Amounts reclassified from accumulated other
            
 
    
          comprehensive income (loss)
  
-
   
-
   
245
 
 (a)
  
245
 
     Net current period other comprehensive income (loss)
  
12,439
   
(279
)
  
(488
)
 
  
11,672
 
 
            
 
    
Balance at December 31, 2017
 
$
(16,537
)
 
$
145
  
$
(3,233
)
 
 
$
(19,625
)

(a)
This reclassification relates to the amortization of prior service costs and gains/losses associated with the Company's SERP plan.  This expense is allocated between cost of sales and selling, general and administrative expense based upon the employment classification of the plan participants.