CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Common stock, per share (in dollars per share)	$ 0.27	$ 0.24	$ 0.81	$ 0.70
Series H Preferred Stock
Preferred stock, per share (in dollars per share)			637.50	637.50
Series I Preferred Stock
Preferred stock, per share (in dollars per share)	414.06	414.06	1,242.18	1,242.18
Series J Preferred Stock
Preferred stock, per share (in dollars per share)	219.65	612.50	829.58	1,225.00
Series K Preferred Stock
Preferred stock, per share (in dollars per share)	309.38		928.14
Series L Preferred Stock
Preferred stock, per share (in dollars per share)	187.50		187.50
Class B Preferred stock, Series A
Preferred stock, per share (in dollars per share)	$ 15.00	5.83	$ 45.00	5.83
Other Preferred Stock
Preferred stock, per share (in dollars per share)		$ 15.00		$ 30.00