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Preferred Stock of Subsidiaries (Details) (USD $)	Mar. 31, 2012
Disclosure Preferred Stock Of Subsidiaries Details [Abstract]
Preferred stock liquidation preference per share	$ 100

The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share.

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