Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividends declared on common stock, per shares	$ 0.35	$ 0.16	$ 0.04
Subsidiary preferred stock dividends, per share		$ 0.8265	$ 0.8624
Stock repurchased (in shares)	2,518,891
Series A Preferred Stock [Member]
Dividends declared on preferred stock, per share	$ 85	$ 85	$ 85
Series B Preferred Stock [Member]
Dividends declared on preferred stock, per share			$ 49.86