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STOCK-BASED COMPENSATION - Changes in Outstanding Stock Options (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Shares        
Balance at beginning of period (shares)   33,158    
Granted (shares) 0 0 0 900
Exercised (shares) (9,009)      
Forfeited (shares) (158)      
Expired (shares) (7)      
Balance at end of period (shares) 23,984 23,984 33,158  
Options exercisable (shares) 15,208 15,208    
Weighted Average Exercise Price        
Balance at beginning of period (USD per share)   $ 3.42    
Granted (USD per share) $ 0      
Exercised (USD per share) 2.06      
Forfeited (USD per share) 8.16      
Expired (USD per share) 23.21      
Balance at end of period (USD per share) 3.89 3.89 $ 3.42  
Options exercisable (USD per share) $ 3.52 $ 3.52    
Weighted Average Remaining Contractual Term (In Years)        
Balance at end of period   6 years 4 months 24 days    
Options exercisable   6 years 1 month 6 days    
Aggregate Intrinsic Value        
Balance at end of period $ 114,687 $ 114,687    
Options exercisable $ 78,854 $ 78,854