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STOCK REPURCHASE PROGRAM (Details) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 18, 2019
Oct. 20, 2016
Stock repurchase program          
Aggregate amount of share repurchases (in dollars) $ 86,497 $ 3,905 $ 120,540    
Common stock repurchased (retired and held in treasury) (in shares) 779 668      
Common stock repurchased (retired and held in treasury) $ 86,500 $ 61,700      
Common stock repurchased and retired (in shares)   623      
Common stock repurchased and retired   $ 57,786 $ 40,994    
Remaining authorized repurchase amount $ 278,500        
Stock Repurchase Program October 20, 2016          
Stock repurchase program          
Share repurchases authorized amount         $ 350,000
Stock Repurchase Program April 18, 2019          
Stock repurchase program          
Share repurchases authorized amount       $ 350,000