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Credit Facility (Details) (Line of Credit [Member], Bank of America [Member], USD $) In Millions, except Share data, unless otherwise specified	Jun. 13, 2011
Line of Credit Facility [Line Items]
Aggregate purchase price of preferred shares	$ 135
Subsidiary Issuer [Member] \| Maximum [Member]
Line of Credit Facility [Line Items]
Maximum number of shares of Class A Preferred Shares of wholly owned subsidiary available for sale	1,431

The number of nonredeemable preferred stock (shares) (or preferred stock redeemable solely at the option of the issuer) allocated to investors to buy shares of a new issue of preferred stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

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