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STOCK REPURCHASE PROGRAM (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Oct. 20, 2016
STOCK REPURCHASE PROGRAM      
Share repurchases authorized amount     $ 350,000
Common stock repurchased (in shares) 189    
Aggregate amount of share repurchases (in dollars) $ 3,905    
Common stock repurchased (retired and held in treasury) (in shares) 189    
Common stock repurchased (retired and held in treasury) $ 16,700    
Common stock repurchased and retired (in shares) 144 210  
Common stock repurchased and retired $ 12,797 $ 16,019  
Remaining authorized repurchase amount $ 125,200