Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Restricted Stock, RSUs, Performance Shares (Details)

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SHARE-BASED COMPENSATION - Restricted Stock, RSUs, Performance Shares (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Weighted-Average Grant Date Fair Value Per Share (USD per share):      
Granted (in USD per share) $ 13.91 $ 14.98 $ 11.13
Restricted Stock Awards      
Shares:      
Nonvested at beginning of period (in shares) 201    
Granted (in shares) 0    
Vested (in shares) (199)    
Forfeited (in shares) (2)    
Nonvested at end of period (in shares) 0 201  
Weighted-Average Grant Date Fair Value Per Share (USD per share):      
Nonvested at beginning of period (in USD per share) $ 9.68    
Granted (in USD per share) 0    
Vested (in USD per share) 9.68    
Forfeited (in USD per share) 9.68    
Nonvested at end of period (in USD per share) $ 0 $ 9.68  
Restricted Stock Units      
Shares:      
Nonvested at beginning of period (in shares) 15,480    
Granted (in shares) 5,581    
Vested (in shares) (5,267)    
Forfeited (in shares) (505)    
Nonvested at end of period (in shares) 15,289 15,480  
Weighted-Average Grant Date Fair Value Per Share (USD per share):      
Nonvested at beginning of period (in USD per share) $ 12.51    
Granted (in USD per share) 13.93    
Vested (in USD per share) 11.17    
Forfeited (in USD per share) 13.47    
Nonvested at end of period (in USD per share) $ 13.42 $ 12.51  
Performance Share Units      
Shares:      
Nonvested at beginning of period (in shares) 2,958    
Granted (in shares) 680    
Vested (in shares) (854)    
Forfeited (in shares) (15)    
Nonvested at end of period (in shares) 2,769 2,958  
Weighted-Average Grant Date Fair Value Per Share (USD per share):      
Nonvested at beginning of period (in USD per share) $ 11.75    
Granted (in USD per share) 13.77    
Vested (in USD per share) 10.07    
Forfeited (in USD per share) 14.30    
Nonvested at end of period (in USD per share) $ 13.49 $ 11.75