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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
 12 Months Ended
Dec. 31, 2017
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]  
Supplemental Cash Flow Information
Cash paid during the year for:
  
2017
  
2016
  
2015
 
Income taxes
 
$
25,845
  
$
30,741
  
$
19,551
 
Interest
 
$
7,021
  
$
6,669
  
$
5,987
 

Non-cash financing activities:
  
2017
  
2016
  
2015
 
Dividends payable
 
$
13,484
  
$
12,088
  
$
10,727