REDEEMABLE PREFERRED STOCK - Dividends Narrative (Details) - USD ($)		3 Months Ended	6 Months Ended
	Dec. 22, 2020	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Class of Stock [Line Items]
Initial dividend on common stock	$ 4,448,223
Initial dividend, common stock, paid			$ 2,226,000	$ 2,207,000
Payments on preferred stock dividends			$ 12,965,000	$ 12,589,000
Series A Preferred Stock
Class of Stock [Line Items]
Cumulative dividend rate			5.50%
Preferred dividend per share per quarter (in usd per share)			$ 0.34375
Payments on preferred stock dividends		$ 4,200,000	$ 4,500,000
Series D Preferred Stock
Class of Stock [Line Items]
Cumulative dividend rate			5.65%
Preferred dividend per share per quarter (in usd per share)			$ 0.35313
Payments on preferred stock dividends		1,000	$ 16,000
Series L Preferred Stock
Class of Stock [Line Items]
Cumulative dividend rate			5.50%
Preferred dividend per share per quarter (in usd per share)			$ 1.56035
Dividend increase per year for failure to timely declare or pay dividends			1.00%
Dividend increase per year for failure to timely declare or pay dividends, maximum increase			8.50%
Payments on preferred stock dividends		$ 8,400,000	$ 8,400,000