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SHARE-BASED COMPENSATION - Stock Options Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares Under Options        
Outstanding at January 1 (in shares) 2,603,664 2,472,284 2,289,139  
Granted (in shares) 2,146,885 137,259 196,713  
Exercised (in shares) 0 0 (8,501)  
Forfeited or expired (in shares) 0 (5,879) (5,067)  
Outstanding at December 31 (in shares) 4,750,549 2,603,664 2,472,284 2,289,139
Weighted Average Exercise Price per Share        
Outstanding at January 1 (in dollars per share) $ 24.09 $ 23.86 $ 23.89  
Granted (in dollars per share) 21.71 28.36 23.52  
Exercised (in dollars per share) 0.00 0.00 24.46  
Forfeited or expired (in dollars per share) 0.00 23.17 24.46  
Outstanding at December 31 (in dollars per share) $ 23.02 $ 24.09 $ 23.86 $ 23.89
Outstanding, weighted average expected remaining term (in years) 4 years 5 months 22 days 4 years 4 months 25 days 5 years 4 months 6 years 1 month 24 days
Granted, weighted average expected remaining term (in years) 4 years 6 months 30 days 6 years 2 days 6 years  
Exercisable at December 31, 2018 (in shares) 807,352      
Exercisable at December 31, 2018, weighted average exercised price per share (in dollars per share) $ 24.03