Annual report pursuant to Section 13 and 15(d)

EQUITY AND EARNINGS PER SHARE - Activity in Outstanding Options (Details)

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EQUITY AND EARNINGS PER SHARE - Activity in Outstanding Options (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Beginning balance, Outstanding options (in shares) 8,498,138 18,502,188
Options granted (in shares) 6,352,000 5,799,166
Options exercised (in shares) (2,041,222) (15,803,216)
Options expired unexercised (in shares) 0 0
Ending balance, Outstanding options (in shares) 12,808,916 8,498,138
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted average exercise price, options granted (in dollars per share) $ 16.20 $ 17.23
Weighted average exercise price, options exercised (in dollars per share) $ 13.88 $ 14.30