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STOCK-BASED COMPENSATION PLANS (Details) - $ / shares
shares in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Non-Vested Stock Awards Outstanding    
Non-vested Stock Awards Outstanding, Number of Shares    
Balance at the beginning of the period (in shares) 418  
Granted (in shares) 92  
Stock awards vested (in shares) (87) (101)
Forfeited (in shares) (4)  
Balance at the end of the period (in shares) 419  
Non-vested Stock Awards Outstanding, Weighted-Average Grant Date Fair Value    
Balance at the beginning of the period (in dollars per share) $ 29.68  
Granted (in dollars per share) 37.67  
Stock awards vested (in dollars per share) 27.92  
Forfeited (in dollars per share) 30.50  
Balance at the end of the period (in dollars per share) $ 32.41  
Stock Options Outstanding    
Stock Options Outstanding, Number of Shares    
Balance at the beginning of the period (in shares) 76  
Stock options exercised (in shares) (5)  
Expired (in shares) (11)  
Balance at the end of the period (in shares) 60  
Exercisable options at the end of the period (in shares) 60  
Stock Options Outstanding, Weighted-Average Exercise Price    
Balance at the beginning of the period (in dollars per share) $ 13.59  
Stock options exercised (in dollars per share) 14.27  
Expired (in dollars per share) 22.61  
Balance at the end of the period (in dollars per share) 10.56  
Exercisable options at the end of the period (in dollars per share) $ 10.56