Statements of Equity and Accumulated Deficit Parenthetical - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Common Stock, Dividends, Per Share, Declared	$ 0.175	$ 0.2625	$ 0.6125	$ 0.785
Series A Preferred Stock [Member]
Preferred Stock, Dividends Per Share, Declared	5.00	5.00	5.00	5.00
Series A1 Preferred Stock
Preferred Stock, Dividends Per Share, Declared	5.00		5.00
Minimum [Member] | Series M Preferred Stock [Member]
Preferred Stock, Dividends Per Share, Declared	4.79	4.79	4.79	4.79
Minimum [Member] | Series M1 Preferred Stock
Preferred Stock, Dividends Per Share, Declared	5.08		5.08
Maximum [Member] | Series M Preferred Stock [Member]
Preferred Stock, Dividends Per Share, Declared	6.25	$ 6.25	6.25	$ 6.25
Maximum [Member] | Series M1 Preferred Stock
Preferred Stock, Dividends Per Share, Declared	$ 5.92		$ 5.92