Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Dividends on common stock and dividend equivalents declared (in dollars per share)	$ 0.43	$ 0.35
Series A Preferred Stock [Member]
Dividends on preferred stock (in dollars per share)	21.25	42.5
Series E Preferred Stock [Member]
Dividends on preferred stock (in dollars per share)	$ 800	$ 800