CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Dividend declared common share, per share	$ 0.10	$ 0.11	$ 0.13	$ 0.14	$ 0.14	$ 0.15
Series A Preferred Stock
Dividend declared, per preferred share	0.539063	0.539063	0.539063	0.539063	0.539063	0.539063
Series B Preferred Stock
Dividend declared, per preferred share	0.390625	0.390625	0.390625	0.390625	0.390625	0.390625
Series C Preferred Stock
Dividend declared, per preferred share	$ 0.476525	$ 0.476525	$ 0.476525	$ 0.476525	$ 0.476525	$ 0.476525