STOCK INCENTIVE PLANS - Restricted Stock Units Activity (Details) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Units
Shares, unvested units outstanding at end of period (in shares)	5,049,014
Restricted Stock
Units
Shares, unvested units outstanding at beginning of period (in shares)	4,680,786	4,322,115
Shares, granted (in shares)	495,844	542,136
Shares, acquired (in shares)	60,300	0
Shares, net adjustment due to performance (in shares)	0	327,256
Shares, vested (in shares)	(216,373)	(142,687)
Shares, forfeited/expired/canceled (in shares)	(18,239)	(8,334)
Shares, dividend reinvestment (in shares)	46,696	42,310
Shares, unvested units outstanding at end of period (in shares)	5,049,014	5,082,796
Weighted Average Grant Price per Share
Weighted average grant price, invested units outstanding at beginning of period (in dollars per share)	$ 9.71	$ 9.46
Weighted average grant price, granted (in dollars per share)	14.22	12.61
Weighted average grant price, acquired (in dollars per share)	9.41	0
Weighted average grant price, net adjusted due to performance (in dollars per share)	0	11.84
Weighted average grant price, vested (in dollars per share)	8.77	7.29
Weighted average grant price, forfeited/expired/canceled (in dollars per share)	9.34	7.52
Weighted average grant price, dividend reinvestment (in dollars per share)	12.85	13.43
Weighted average grant price, invested units outstanding at end of period (in dollars per share)	$ 10.22	$ 10.05