Annual report pursuant to Section 13 and 15(d)

STOCK???BASED COMPENSATION - Summary of Performance Shares Activity (Details)

v3.20.4
STOCK‑BASED COMPENSATION - Summary of Performance Shares Activity (Details) - Performance stock units
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Outstanding at Beginning of Period (in shares) 522,621
Target Shares Granted (in shares) 1,007,058
Target Shares Vested (in shares) (151,492)
Target Shares Forfeited (in shares) (358,909)
Outstanding at End of Period (in shares) 1,019,278
Weighted Average FV Per Share  
Outstanding at Beginning of Period (in dollars per share) | $ / shares $ 23.88
Target Shares Granted (in dollars per share) | $ / shares 9.31
Target Shares Vested (in dollars per share) | $ / shares 10.73
Target Shares Forfeited (in dollars per share) | $ / shares 21.51
Outstanding at End of Period (in dollars per share) | $ / shares $ 12.27
2017  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Outstanding at Beginning of Period (in shares) 151,492
Target Shares Granted (in shares) 0
Target Shares Vested (in shares) (151,492)
Target Shares Forfeited (in shares) 0
Outstanding at End of Period (in shares) 0
Weighted Average FV Per Share  
Outstanding at End of Period (in dollars per share) | $ / shares $ 10.73
2018  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Outstanding at Beginning of Period (in shares) 156,576
Target Shares Granted (in shares) 0
Target Shares Vested (in shares) 0
Target Shares Forfeited (in shares) (72,254)
Outstanding at End of Period (in shares) 84,322
Weighted Average FV Per Share  
Outstanding at End of Period (in dollars per share) | $ / shares $ 27.51
2019  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Outstanding at Beginning of Period (in shares) 214,553
Target Shares Granted (in shares) 0
Target Shares Vested (in shares) 0
Target Shares Forfeited (in shares) (88,235)
Outstanding at End of Period (in shares) 126,318
Weighted Average FV Per Share  
Outstanding at End of Period (in dollars per share) | $ / shares $ 27.49
2020  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]  
Outstanding at Beginning of Period (in shares) 0
Target Shares Granted (in shares) 1,007,058
Target Shares Vested (in shares) 0
Target Shares Forfeited (in shares) (198,420)
Outstanding at End of Period (in shares) 808,638
Weighted Average FV Per Share  
Outstanding at End of Period (in dollars per share) | $ / shares $ 8.30