CONSOLIDATED STATEMENTS OF CASH FLOWS [Parenthetical]	12 Months Ended
	Dec. 31, 2018
Series A Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage	8.25%
Series B Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage	6.00%
Series C Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage	7.625%
Series D Preferred Stock [Member]
Preferred Stock, Dividend Rate, Percentage	7.125%
6.0% Redeemable Preferred Stock
Preferred Stock, Dividend Rate, Percentage	6.00%