Subsidiary Preferred Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Subsidiary Preferred Stock (Textual) [Abstract]
Preferred shares, shares issued	0	0
Preferred shares, par value	$ 0.001	$ 0.001
Preferred shares, shares authorized	25,000,000	25,000,000
Entitlement of Preferred Stock Voting Rights	one vote per share
Superior Subsidiary [Member]
Subsidiary Preferred Stock (Textual) [Abstract]
Preferred shares, shares issued	75,000,000
Preferred shares, par value	$ 0.01
Preferred shares, shares authorized	10,000,000
Cumulative Preferred Divided	$ 40.00
Per share liquidation preference	$ 1,000
Liquidation Preference of preferred stock	$ 75.0
101% of the Liquidation Value, plus all accrued dividends	101% of the Liquidation Value, plus all accrued dividends
Convertible rate of preferred stock	$ 22.12
Conversion price of preferred stock before acquisition	$ 25.00
Conversion rate of deemed common shares	40 deemed common shares for each share of preferred stock
Number of deemed common shares in conversion	3,000,000
Redemption value of deemed common shares	$ 66.4