CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Common Stock, Dividends, Per Share, Declared	$ 0.215	$ 0.185	$ 0.645	$ 0.555
5.875% Series A Cumulative Redeemable Preferred Stock
Preferred Stock, Dividend Rate, Percentage			5.875%		5.875%
Preferred Stock, Dividends Per Share, Declared	0.367188	0.367188	$ 1.101564	1.101564
5.875% Series B Cumulative Redeemable Preferred Stock
Preferred Stock, Dividend Rate, Percentage			5.875%		5.875%
Preferred Stock, Dividends Per Share, Declared	0.367188	$ 0.367188	$ 1.101564	$ 1.101564
5.625% Series C Cumulative Redeemable Preferred Stock
Preferred Stock, Dividend Rate, Percentage		5.625%	5.625%	5.625%	5.625%
Preferred Stock, Dividends Per Share, Declared	$ 0.351563		$ 1.054689
4.00% Cumulative Redeemable Convertible Preferred Units
Preferred Stock, Dividend Rate, Percentage			4.00%
4.43937% Cumulative Redeemable Convertible Preferred Units
Preferred Stock, Dividend Rate, Percentage				4.43937%