Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Summary of Restricted Stock Transactions (Details)

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SHARE-BASED COMPENSATION - Summary of Restricted Stock Transactions (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares      
Unvested at January 1, 2019 24,384    
Granted (in shares) 635    
Vested (in shares) (130)    
Forfeited (in shares) (264)    
Unvested at December 31, 2019 24,625 24,384  
Weighted-Average Grant Date Fair Value      
Unvested (in dollars per share) $ 7.56 $ 7.59  
Granted (in dollars per share) 8.53 $ 11.02 $ 9.59
Vested (in dollars per share) 9.24    
Forfeited (in dollars per share) $ 12.04