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EQUITY PLANS EQUITY PLANS - RSU and PSU equity activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at beginning of period (in shares) 76,343    
Granted (in shares) 762,670    
Vested (in shares) (422,962)    
Forfeited (in shares) 1,642    
Outstanding at end of period (in shares) 414,409 76,343  
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at beginning of period (in shares) 53,613    
Granted (in shares) 48,209    
Vested (in shares) (53,617)    
Forfeited (in shares) 16,727    
Outstanding at end of period (in shares) 31,478 53,613  
Liability classified restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Outstanding at beginning of period (in shares) 9,572    
Vested (in shares) (9,572)    
Forfeited (in shares) 0    
Outstanding at end of period (in shares) 0 9,572  
Weighted Average Grant Date Fair Value      
Outstanding at beginning of period (in dollar per share) $ 25.50    
Vested (in dollar per share) 25.50    
Forfeited (in dollar per share) 25.50    
Outstanding at end of period (in dollar per share) 25.50 $ 25.50  
RSUs and PSUs      
Weighted Average Grant Date Fair Value      
Outstanding at beginning of period (in dollar per share) 28.57    
Granted (in dollar per share) 31.27 30.68 $ 27.15
Vested (in dollar per share) 26.17    
Forfeited (in dollar per share) 26.52    
Outstanding at end of period (in dollar per share) $ 36.12 $ 28.57