CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Common stock, per share (in dollars per share)	$ 0.27	$ 0.24	$ 0.54	$ 0.46
Preferred Stock, Series H
Preferred stock, per share (in dollars per share)	637.50	637.50	637.50	637.50
Preferred Stock, Series I
Preferred stock, per share (in dollars per share)	414.06	414.06	828.12	828.12
Preferred Stock, Series J
Preferred stock, per share (in dollars per share)	289.38		609.93	612.50
Preferred Stock, Series K
Preferred stock, per share (in dollars per share)	309.38		618.76
Class B Preferred stock, Series A
Preferred stock, per share (in dollars per share)	$ 15.00		$ 30.00
Preferred Stock, Series C
Preferred stock, per share (in dollars per share)		$ 15.00		$ 15.00