Consolidated Statements Of Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statement Of Stockholders' Equity [Line Items]
Dividends declared on common stock, per share	$ 0.16	$ 0.04	$ 0.04
Subsidiary preferred stock dividends, per share	$ 0.83	$ 0.86	$ 0.86
Series A Preferred Stock [Member]
Statement Of Stockholders' Equity [Line Items]
Dividends declared on preferred stock	$ 85.00	$ 85.00	$ 85.00
Series B Cumulative Redeemable Preferred Stock [Member]
Statement Of Stockholders' Equity [Line Items]
Dividends incurred on preferred stock		$ 49.86	$ 50.00
Series C Preferred Stock [Member]
Statement Of Stockholders' Equity [Line Items]
Dividends incurred on preferred stock			$ 1.0