Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash dividends declared per common share (in dollars per share)	$ 0.565	$ 0.38	$ 0.33
Series A Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in dollars per share)		1.9375	7.75
Series C Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in dollars per share)		0.539063	0.539063
Series D Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in dollars per share)	50.00	50.00	$ 13.33
Series E Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in dollars per share)	1.531252	$ 1.544012
Series F Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in dollars per share)	$ 0.529688