REDEEMABLE PREFERRED STOCK - Dividends Narrative (Details) - USD ($)		12 Months Ended
	Dec. 22, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Initial dividend on common stock	$ 4,448,223
Payments on preferred stock dividends		$ 16,536,000	$ 22,157,000	$ 2,173,000
Series A Preferred Stock
Class of Stock [Line Items]
Annual dividend rate		5.50%
Preferred stock, dividend rate (in usd per share)		$ 0.34375
Payments on preferred stock dividends		$ 8,100,000	4,400,000
Series D Preferred Stock
Class of Stock [Line Items]
Annual dividend rate		5.65%
Preferred stock, dividend rate (in usd per share)		$ 0.35313
Payments on preferred stock dividends		$ 12,000	0
Series L Preferred Stock
Class of Stock [Line Items]
Annual dividend rate		5.50%
Preferred stock, dividend rate (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	$ 17,800,000