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STOCK-BASED COMPENSATION PLANS - Restricted Stock Awards and Units and Performance-Based Stock Units (Details)
 3 Months Ended
Mar. 31, 2022
$ / shares
shares
RSUs  
Shares  
Unvested balance at the beginning of the period (in shares) | shares 5,389,611
Granted (in shares) | shares 71,077
Vested (in shares) | shares (1,610,990)
Forfeited (in shares) | shares (138,550)
Unvested balance at the end of the period (in shares) | shares 3,711,148
Weighted Average Grant Date Fair Value  
Unvested balance at the end of the period (in dollars per share) | $ / shares $ 6.19
Granted (in dollars per share) | $ / shares 4.05
Vested (in dollars per share) | $ / shares 6.40
Forfeited (in dollars per share) | $ / shares 6.44
Unvested balance at end of the period (in dollars per share) | $ / shares $ 6.05
PSUs  
Shares  
Unvested balance at the beginning of the period (in shares) | shares 4,987,876
Granted (in shares) | shares 18,225
Vested (in shares) | shares (175,751)
Forfeited (in shares) | shares (283,258)
Unvested balance at the end of the period (in shares) | shares 4,547,092
Weighted Average Grant Date Fair Value  
Unvested balance at the end of the period (in dollars per share) | $ / shares $ 2.87
Granted (in dollars per share) | $ / shares 2.65
Vested (in dollars per share) | $ / shares 5.03
Forfeited (in dollars per share) | $ / shares 7.95
Unvested balance at end of the period (in dollars per share) | $ / shares $ 2.31