Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash dividends declared on common shares (in usd per share)	$ 0.17	$ 0.105
Series D Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in usd per share)	12.50	12.50
Series E Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in usd per share)	0.382813	$ 0.382813
Series F Preferred Stock [Member]
Cash dividends declared on Preferred Stock (in usd per share)	$ 0.353125