CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement Of Stockholders Equity [Abstract]
Common per share (in dollars per share)	$ 0.12	$ 0.14	$ 0.20	$ 0.30
Preferred per share (in dollars per share)	$ 0.47	$ 0.47	$ 0.94	$ 0.94