REDEEMABLE PREFERRED STOCK - Dividends Narrative (Details) - USD ($)		3 Months Ended
	Dec. 22, 2020	Mar. 31, 2021	Mar. 31, 2020
Class of Stock [Line Items]
Initial dividend on common stock	$ 4,448,223
Payments on preferred stock dividends		$ 10,630,000	$ 10,919,000
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		$ 2,200,000	2,500,000
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		$ 7,000	0
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