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STOCK INCENTIVE PLANS - Restricted Stock Units Activity (Details) - $ / shares
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares, unvested units outstanding at end of period (in shares) 4,561,091  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Shares, unvested units outstanding at beginning of period (in shares) 4,322,115 2,858,357
Shares, granted (in shares) 1,113,314 2,004,895
Shares, net adjustment due to performance (in shares) 412,540 47,290
Shares, vested (in shares) (1,309,476) (592,602)
Shares, forfeited/expired/canceled (in shares) (112,002) (169,552)
Shares, dividend reinvestment (in shares) 134,600 173,990
Shares, unvested units outstanding at end of period (in shares) 4,561,091 4,322,378
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]    
Weighted average grant price, invested units outstanding at beginning of period (in dollars per share) $ 9.46 $ 12.56
Weighted average grant price, granted (in dollars per share) 12.65 5.95
Weighted average grant price, net adjusted due to performance (in dollars per share) 11.72 13.00
Weighted average grant price, vested (in dollars per share) 12.10 14.50
Weighted average grant price, forfeited/expired/canceled (in dollars per share) 10.94 13.05
Weighted average grant price, dividend reinvestment (in dollars per share) 12.26 6.99
Weighted average grant price, invested units outstanding at end of period (in dollars per share) $ 9.74 $ 9.45