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COMMON STOCK (Details) - USD ($)
 1 Months Ended 3 Months Ended
Mar. 31, 2009
Mar. 31, 2018
Dec. 31, 2008
Equity, Class of Treasury Stock [Line Items]      
Common stock authorized by the Board of Directors (in shares) 1,200,000   2,250,000
Total purchased shares (in shares) 859,499 0  
Additional estimated shares (in shares)   184,502  
Closing price (in dollars per share)   $ 81.30  
Maximum [Member]      
Equity, Class of Treasury Stock [Line Items]      
Maximum percentage of repurchase of common stock 10.00%    
Bank credit agreement to permit share repurchases of common stock $ 15,000,000