Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends on common stock and dividend equivalents declared, per share	$ 0.89	$ 0.75	$ 0.55
Series A Preferred Stock [Member]
Dividends on preferred stock, per share	21.25	85	85
Series E Preferred Stock [Member]
Dividends on preferred stock, per share	$ 1,600	$ 1,600	$ 1,648.89